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Current hierarchy for propulsion and energy (2,278)
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propulsion and energy (2,278) propulsion and energy (2,278) exclude
  animal powered apparatus (33) propulsion and energy (2,278) -> animal powered apparatus (33)  
  clutches (5) propulsion and energy (2,278) -> clutches (5)  
  coal oil engines (1) propulsion and energy (2,278) -> coal oil engines (1)  
  diesel engines (9) propulsion and energy (2,278) -> diesel engines (9) exclude
    valve gear (2) propulsion and energy (2,278) -> diesel engines (9) -> valve gear (2)  
  gas engines (895) propulsion and energy (2,278) -> gas engines (895) exclude
    carburetors (43) propulsion and energy (2,278) -> gas engines (895) -> carburetors (43)  
    cylinders (1) propulsion and energy (2,278) -> gas engines (895) -> cylinders (1)  
    fuel pumps (3) propulsion and energy (2,278) -> gas engines (895) -> fuel pumps (3)  
    gas engine lubricators (4) propulsion and energy (2,278) -> gas engines (895) -> gas engine lubricators (4)  
    gas engine valves (29) propulsion and energy (2,278) -> gas engines (895) -> gas engine valves (29)  
    gas traction engines (9) propulsion and energy (2,278) -> gas engines (895) -> gas traction engines (9) exclude
      attachments (1) propulsion and energy (2,278) -> gas engines (895) -> gas traction engines (9) -> attachments (1)  
    governors (45) propulsion and energy (2,278) -> gas engines (895) -> governors (45)  
    heat radiators (12) propulsion and energy (2,278) -> gas engines (895) -> heat radiators (12)  
    ignition systems (102) propulsion and energy (2,278) -> gas engines (895) -> ignition systems (102)  
    mufflers (1) propulsion and energy (2,278) -> gas engines (895) -> mufflers (1)  
    radial gas engines (1) propulsion and energy (2,278) -> gas engines (895) -> radial gas engines (1)  
    rotary gas engines (16) propulsion and energy (2,278) -> gas engines (895) -> rotary gas engines (16)  
    starters (13) propulsion and energy (2,278) -> gas engines (895) -> starters (13)  
  gunpowder engines (1) propulsion and energy (2,278) -> gunpowder engines (1)  
  hot air engines (17) propulsion and energy (2,278) -> hot air engines (17)  
  kerosene engines (1) propulsion and energy (2,278) -> kerosene engines (1)  
  nautical propulsion apparatus (4) propulsion and energy (2,278) -> nautical propulsion apparatus (4)  
  oil engines (62) propulsion and energy (2,278) -> oil engines (62) exclude
    oil engine valves (3) propulsion and energy (2,278) -> oil engines (62) -> oil engine valves (3)  
    pistons (1) propulsion and energy (2,278) -> oil engines (62) -> pistons (1)  
    vaporizers (1) propulsion and energy (2,278) -> oil engines (62) -> vaporizers (1)  
  oil gas apparatus (5) propulsion and energy (2,278) -> oil gas apparatus (5)  
  power takeoff apparatus (1) propulsion and energy (2,278) -> power takeoff apparatus (1)  
  propulsion pumps (1) propulsion and energy (2,278) -> propulsion pumps (1)  
  steam apparatus (842) propulsion and energy (2,278) -> steam apparatus (842) exclude
    oscillating steam engines (5) propulsion and energy (2,278) -> steam apparatus (842) -> oscillating steam engines (5)  
    portable steam engines (25) propulsion and energy (2,278) -> steam apparatus (842) -> portable steam engines (25)  
    rotary steam engines (58) propulsion and energy (2,278) -> steam apparatus (842) -> rotary steam engines (58)  
    stationary boilers (185) propulsion and energy (2,278) -> steam apparatus (842) -> stationary boilers (185) exclude
      feedwater apparatus (3) propulsion and energy (2,278) -> steam apparatus (842) -> stationary boilers (185) -> feedwater apparatus (3)  
      spark arresters (1) propulsion and energy (2,278) -> steam apparatus (842) -> stationary boilers (185) -> spark arresters (1)  
      steam pressure gauges (4) propulsion and energy (2,278) -> steam apparatus (842) -> stationary boilers (185) -> steam pressure gauges (4)  
      steam pumps (2) propulsion and energy (2,278) -> steam apparatus (842) -> stationary boilers (185) -> steam pumps (2)  
      steam valves (1) propulsion and energy (2,278) -> steam apparatus (842) -> stationary boilers (185) -> steam valves (1)  
    steam carriages (19) propulsion and energy (2,278) -> steam apparatus (842) -> steam carriages (19)  
    steam fire engines (2) propulsion and energy (2,278) -> steam apparatus (842) -> steam fire engines (2)  
    steam motors (3) propulsion and energy (2,278) -> steam apparatus (842) -> steam motors (3)  
    steam plows (14) propulsion and energy (2,278) -> steam apparatus (842) -> steam plows (14)  
    steam pumping engines (2) propulsion and energy (2,278) -> steam apparatus (842) -> steam pumping engines (2)  
    steam pumps (21) propulsion and energy (2,278) -> steam apparatus (842) -> steam pumps (21)  
    steam road engines (45) propulsion and energy (2,278) -> steam apparatus (842) -> steam road engines (45)  
    steam road wagons (5) propulsion and energy (2,278) -> steam apparatus (842) -> steam road wagons (5)  
    steam rollers (9) propulsion and energy (2,278) -> steam apparatus (842) -> steam rollers (9)  
    steam safety valves (9) propulsion and energy (2,278) -> steam apparatus (842) -> steam safety valves (9)  
    steam stills (43) propulsion and energy (2,278) -> steam apparatus (842) -> steam stills (43)  
    steam traction engines (397) propulsion and energy (2,278) -> steam apparatus (842) -> steam traction engines (397) exclude
      bearings and bearing supports (3) propulsion and energy (2,278) -> steam apparatus (842) -> steam traction engines (397) -> bearings and bearing supports (3)  
      boiler leveling apparatus (3) propulsion and energy (2,278) -> steam apparatus (842) -> steam traction engines (397) -> boiler leveling apparatus (3)  
      brakes (2) propulsion and energy (2,278) -> steam apparatus (842) -> steam traction engines (397) -> brakes (2)  
      cabs and roofs (2) propulsion and energy (2,278) -> steam apparatus (842) -> steam traction engines (397) -> cabs and roofs (2)  
      clutches (2) propulsion and energy (2,278) -> steam apparatus (842) -> steam traction engines (397) -> clutches (2)  
      connecting rods (1) propulsion and energy (2,278) -> steam apparatus (842) -> steam traction engines (397) -> connecting rods (1)  
      engine boilers (3) propulsion and energy (2,278) -> steam apparatus (842) -> steam traction engines (397) -> engine boilers (3)  
      propulsion components (69) propulsion and energy (2,278) -> steam apparatus (842) -> steam traction engines (397) -> propulsion components (69)  
      spark arresters (3) propulsion and energy (2,278) -> steam apparatus (842) -> steam traction engines (397) -> spark arresters (3)  
      steering apparatus (41) propulsion and energy (2,278) -> steam apparatus (842) -> steam traction engines (397) -> steering apparatus (41)  
      suspensions (26) propulsion and energy (2,278) -> steam apparatus (842) -> steam traction engines (397) -> suspensions (26)  
      tenders (6) propulsion and energy (2,278) -> steam apparatus (842) -> steam traction engines (397) -> tenders (6)  
      tracks (18) propulsion and energy (2,278) -> steam apparatus (842) -> steam traction engines (397) -> tracks (18)  
      traction engine bearings (1) propulsion and energy (2,278) -> steam apparatus (842) -> steam traction engines (397) -> traction engine bearings (1)  
      wheels (8) propulsion and energy (2,278) -> steam apparatus (842) -> steam traction engines (397) -> wheels (8)  
    steamboats (14) propulsion and energy (2,278) -> steam apparatus (842) -> steamboats (14)  
  steam engines (348) propulsion and energy (2,278) -> steam engines (348) exclude
    steam check valves (3) propulsion and energy (2,278) -> steam engines (348) -> steam check valves (3)  
    steam dash pots (1) propulsion and energy (2,278) -> steam engines (348) -> steam dash pots (1)  
    steam engine brakes (1) propulsion and energy (2,278) -> steam engines (348) -> steam engine brakes (1)  
    steam engine crank rods (1) propulsion and energy (2,278) -> steam engines (348) -> steam engine crank rods (1)  
    steam engine cylinders (4) propulsion and energy (2,278) -> steam engines (348) -> steam engine cylinders (4)  
    steam engine governors (30) propulsion and energy (2,278) -> steam engines (348) -> steam engine governors (30)  
    steam engine lubricators (3) propulsion and energy (2,278) -> steam engines (348) -> steam engine lubricators (3)  
    steam engine pistons (6) propulsion and energy (2,278) -> steam engines (348) -> steam engine pistons (6) exclude
      piston ring and packing (4) propulsion and energy (2,278) -> steam engines (348) -> steam engine pistons (6) -> piston ring and packing (4)  
    steam engine stuffing boxes (2) propulsion and energy (2,278) -> steam engines (348) -> steam engine stuffing boxes (2)  
    steam engine valve gear (29) propulsion and energy (2,278) -> steam engines (348) -> steam engine valve gear (29)  
    steam engine valves (17) propulsion and energy (2,278) -> steam engines (348) -> steam engine valves (17)  
  water power (78) propulsion and energy (2,278) -> water power (78) exclude
    water wheels (78) propulsion and energy (2,278) -> water power (78) -> water wheels (78) exclude
      turbine water wheels (4) propulsion and energy (2,278) -> water power (78) -> water wheels (78) -> turbine water wheels (4)  
 
Full Hierarchy | abrasives and holders (4) | adzes (8) | agricultural machines (1,606) | agricultural tools (139) | armaments (62) | axes (95) | braces (301)
chisels (70) | combination tools (503) | construction machines (45) | electrical devices (379) | files (73) | gauges (47) | hammers (315) | hand drills (977)
handsaws (1,013) | household machines (446) | household tools (725) | household (319) | industrial machines (304) | industrial tools (190) | knives and cutters (118) | layout tools (2,397)
machinist tools (514) | metalworking machines (2,972) | miter boxes (169) | planes (700) | pliers (553) | potters tools (3) | propulsion and energy (2,278) | punches (22)
rules (400) | scrapers (46) | screwdrivers (418) | shaves (77) | specialty machines (861) | specialty tools (239) | stoneworking machines (44) | structures (59)
tool handles (80) | tool holders (63) | tool making (242) | tool storage (47) | trade specific (4,850) | transportation machines (112) | transportation tools (9) | water distribution systems (67)
woodworking machines (14,195) | work holding (1,018) | wrenches (4,838)

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