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Current hierarchy for propulsion and energy (2,347)
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propulsion and energy (2,347) propulsion and energy (2,347) exclude
  animal powered apparatus (33) propulsion and energy (2,347) -> animal powered apparatus (33)  
  clutches (7) propulsion and energy (2,347) -> clutches (7)  
  external combustion engines (17) propulsion and energy (2,347) -> external combustion engines (17) exclude
    hot air engines (17) propulsion and energy (2,347) -> external combustion engines (17) -> hot air engines (17)  
  gunpowder engines (1) propulsion and energy (2,347) -> gunpowder engines (1)  
  internal combustion engines (973) propulsion and energy (2,347) -> internal combustion engines (973) exclude
    carburetors (44) propulsion and energy (2,347) -> internal combustion engines (973) -> carburetors (44)  
    coal oil engines (1) propulsion and energy (2,347) -> internal combustion engines (973) -> coal oil engines (1)  
    cylinders (2) propulsion and energy (2,347) -> internal combustion engines (973) -> cylinders (2)  
    diesel engines (9) propulsion and energy (2,347) -> internal combustion engines (973) -> diesel engines (9) exclude
      valve gear (2) propulsion and energy (2,347) -> internal combustion engines (973) -> diesel engines (9) -> valve gear (2)  
    fuel pumps (3) propulsion and energy (2,347) -> internal combustion engines (973) -> fuel pumps (3)  
    governors (46) propulsion and energy (2,347) -> internal combustion engines (973) -> governors (46)  
    heat radiators (13) propulsion and energy (2,347) -> internal combustion engines (973) -> heat radiators (13)  
    ignition systems (104) propulsion and energy (2,347) -> internal combustion engines (973) -> ignition systems (104)  
    internal combustion engine valves (31) propulsion and energy (2,347) -> internal combustion engines (973) -> internal combustion engine valves (31)  
    internal combustion traction engines (14) propulsion and energy (2,347) -> internal combustion engines (973) -> internal combustion traction engines (14) exclude
      attachments (1) propulsion and energy (2,347) -> internal combustion engines (973) -> internal combustion traction engines (14) -> attachments (1)  
    kerosene engines (1) propulsion and energy (2,347) -> internal combustion engines (973) -> kerosene engines (1)  
    lubricators (4) propulsion and energy (2,347) -> internal combustion engines (973) -> lubricators (4)  
    mufflers (1) propulsion and energy (2,347) -> internal combustion engines (973) -> mufflers (1)  
    oil engines (62) propulsion and energy (2,347) -> internal combustion engines (973) -> oil engines (62) exclude
      pistons (1) propulsion and energy (2,347) -> internal combustion engines (973) -> oil engines (62) -> pistons (1)  
      valves (3) propulsion and energy (2,347) -> internal combustion engines (973) -> oil engines (62) -> valves (3)  
      vaporizers (1) propulsion and energy (2,347) -> internal combustion engines (973) -> oil engines (62) -> vaporizers (1)  
    radial engines (1) propulsion and energy (2,347) -> internal combustion engines (973) -> radial engines (1)  
    rotary engines (16) propulsion and energy (2,347) -> internal combustion engines (973) -> rotary engines (16)  
    starters (13) propulsion and energy (2,347) -> internal combustion engines (973) -> starters (13)  
  nautical propulsion apparatus (4) propulsion and energy (2,347) -> nautical propulsion apparatus (4)  
  oil gas apparatus (5) propulsion and energy (2,347) -> oil gas apparatus (5)  
  power takeoff apparatus (1) propulsion and energy (2,347) -> power takeoff apparatus (1)  
  propulsion pumps (1) propulsion and energy (2,347) -> propulsion pumps (1)  
  steam apparatus (884) propulsion and energy (2,347) -> steam apparatus (884) exclude
    oscillating steam engines (5) propulsion and energy (2,347) -> steam apparatus (884) -> oscillating steam engines (5)  
    portable steam engines (25) propulsion and energy (2,347) -> steam apparatus (884) -> portable steam engines (25)  
    rotary steam engines (64) propulsion and energy (2,347) -> steam apparatus (884) -> rotary steam engines (64)  
    stationary boilers (187) propulsion and energy (2,347) -> steam apparatus (884) -> stationary boilers (187) exclude
      feedwater apparatus (4) propulsion and energy (2,347) -> steam apparatus (884) -> stationary boilers (187) -> feedwater apparatus (4)  
      spark arresters (1) propulsion and energy (2,347) -> steam apparatus (884) -> stationary boilers (187) -> spark arresters (1)  
      steam pressure gauges (4) propulsion and energy (2,347) -> steam apparatus (884) -> stationary boilers (187) -> steam pressure gauges (4)  
      steam pumps (2) propulsion and energy (2,347) -> steam apparatus (884) -> stationary boilers (187) -> steam pumps (2)  
      steam valves (2) propulsion and energy (2,347) -> steam apparatus (884) -> stationary boilers (187) -> steam valves (2)  
    steam carriages (19) propulsion and energy (2,347) -> steam apparatus (884) -> steam carriages (19)  
    steam fire engines (2) propulsion and energy (2,347) -> steam apparatus (884) -> steam fire engines (2)  
    steam motors (3) propulsion and energy (2,347) -> steam apparatus (884) -> steam motors (3)  
    steam plows (14) propulsion and energy (2,347) -> steam apparatus (884) -> steam plows (14)  
    steam pumping engines (2) propulsion and energy (2,347) -> steam apparatus (884) -> steam pumping engines (2)  
    steam pumps (22) propulsion and energy (2,347) -> steam apparatus (884) -> steam pumps (22)  
    steam road engines (45) propulsion and energy (2,347) -> steam apparatus (884) -> steam road engines (45)  
    steam road wagons (5) propulsion and energy (2,347) -> steam apparatus (884) -> steam road wagons (5)  
    steam rollers (10) propulsion and energy (2,347) -> steam apparatus (884) -> steam rollers (10)  
    steam safety valves (11) propulsion and energy (2,347) -> steam apparatus (884) -> steam safety valves (11)  
    steam stills (43) propulsion and energy (2,347) -> steam apparatus (884) -> steam stills (43)  
    steam traction engines (426) propulsion and energy (2,347) -> steam apparatus (884) -> steam traction engines (426) exclude
      bearings and bearing supports (3) propulsion and energy (2,347) -> steam apparatus (884) -> steam traction engines (426) -> bearings and bearing supports (3)  
      boiler leveling apparatus (3) propulsion and energy (2,347) -> steam apparatus (884) -> steam traction engines (426) -> boiler leveling apparatus (3)  
      boilers (1) propulsion and energy (2,347) -> steam apparatus (884) -> steam traction engines (426) -> boilers (1)  
      brakes (3) propulsion and energy (2,347) -> steam apparatus (884) -> steam traction engines (426) -> brakes (3)  
      cabs and roofs (2) propulsion and energy (2,347) -> steam apparatus (884) -> steam traction engines (426) -> cabs and roofs (2)  
      clutches (3) propulsion and energy (2,347) -> steam apparatus (884) -> steam traction engines (426) -> clutches (3)  
      connecting rods (1) propulsion and energy (2,347) -> steam apparatus (884) -> steam traction engines (426) -> connecting rods (1)  
      engine boilers (4) propulsion and energy (2,347) -> steam apparatus (884) -> steam traction engines (426) -> engine boilers (4)  
      governors (3) propulsion and energy (2,347) -> steam apparatus (884) -> steam traction engines (426) -> governors (3)  
      propulsion components (77) propulsion and energy (2,347) -> steam apparatus (884) -> steam traction engines (426) -> propulsion components (77)  
      spark arresters (4) propulsion and energy (2,347) -> steam apparatus (884) -> steam traction engines (426) -> spark arresters (4)  
      steering apparatus (45) propulsion and energy (2,347) -> steam apparatus (884) -> steam traction engines (426) -> steering apparatus (45)  
      superheaters (1) propulsion and energy (2,347) -> steam apparatus (884) -> steam traction engines (426) -> superheaters (1)  
      suspensions (28) propulsion and energy (2,347) -> steam apparatus (884) -> steam traction engines (426) -> suspensions (28)  
      tenders (6) propulsion and energy (2,347) -> steam apparatus (884) -> steam traction engines (426) -> tenders (6)  
      tracks (19) propulsion and energy (2,347) -> steam apparatus (884) -> steam traction engines (426) -> tracks (19)  
      traction engine bearings (1) propulsion and energy (2,347) -> steam apparatus (884) -> steam traction engines (426) -> traction engine bearings (1)  
      valve gear (1) propulsion and energy (2,347) -> steam apparatus (884) -> steam traction engines (426) -> valve gear (1)  
      wheels (10) propulsion and energy (2,347) -> steam apparatus (884) -> steam traction engines (426) -> wheels (10)  
    steamboats (14) propulsion and energy (2,347) -> steam apparatus (884) -> steamboats (14)  
  steam engines (361) propulsion and energy (2,347) -> steam engines (361) exclude
    steam check valves (3) propulsion and energy (2,347) -> steam engines (361) -> steam check valves (3)  
    steam dash pots (1) propulsion and energy (2,347) -> steam engines (361) -> steam dash pots (1)  
    steam engine brakes (1) propulsion and energy (2,347) -> steam engines (361) -> steam engine brakes (1)  
    steam engine crank rods (1) propulsion and energy (2,347) -> steam engines (361) -> steam engine crank rods (1)  
    steam engine cylinders (4) propulsion and energy (2,347) -> steam engines (361) -> steam engine cylinders (4)  
    steam engine governors (34) propulsion and energy (2,347) -> steam engines (361) -> steam engine governors (34)  
    steam engine lubricators (3) propulsion and energy (2,347) -> steam engines (361) -> steam engine lubricators (3)  
    steam engine packing (1) propulsion and energy (2,347) -> steam engines (361) -> steam engine packing (1)  
    steam engine pistons (6) propulsion and energy (2,347) -> steam engines (361) -> steam engine pistons (6) exclude
      piston ring and packing (4) propulsion and energy (2,347) -> steam engines (361) -> steam engine pistons (6) -> piston ring and packing (4)  
    steam engine stuffing boxes (2) propulsion and energy (2,347) -> steam engines (361) -> steam engine stuffing boxes (2)  
    steam engine valve gear (33) propulsion and energy (2,347) -> steam engines (361) -> steam engine valve gear (33)  
    steam engine valves (20) propulsion and energy (2,347) -> steam engines (361) -> steam engine valves (20)  
  water power (78) propulsion and energy (2,347) -> water power (78) exclude
    water wheels (78) propulsion and energy (2,347) -> water power (78) -> water wheels (78) exclude
      turbine water wheels (4) propulsion and energy (2,347) -> water power (78) -> water wheels (78) -> turbine water wheels (4)  
 
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household machines (454) | household tools (731) | household (329) | industrial machines (324) | industrial tools (214) | knives and cutters (120) | layout tools (2,400) | metalworking machines (3,138)
metalworking tools (672) | musical instruments (2) | pliers (620) | potters tools (3) | propulsion and energy (2,347) | punches (28) | rules (403) | screwdrivers (426)
specialty machines (887) | specialty tools (352) | stoneworking machines (44) | structures (59) | tool handles (88) | tool holders (63) | tool making (257) | tool storage (50)
trade specific (4,888) | transportation machines (127) | transportation tools (9) | water distribution systems (68) | woodworking machines (14,245) | woodworking tools (3,654) | work holding (1,035) | wrenches (5,343)

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