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Current hierarchy for propulsion and energy (884)
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propulsion and energy (884) propulsion and energy (884) exclude
  clutches (2) propulsion and energy (884) -> clutches (2)  
  gas engines (329) propulsion and energy (884) -> gas engines (329) exclude
    carburetors (12) propulsion and energy (884) -> gas engines (329) -> carburetors (12)  
    fuel pumps (1) propulsion and energy (884) -> gas engines (329) -> fuel pumps (1)  
    gas traction engines (4) propulsion and energy (884) -> gas engines (329) -> gas traction engines (4) exclude
      attachments (1) propulsion and energy (884) -> gas engines (329) -> gas traction engines (4) -> attachments (1)  
    governors (10) propulsion and energy (884) -> gas engines (329) -> governors (10)  
    heat radiators (4) propulsion and energy (884) -> gas engines (329) -> heat radiators (4)  
    ignition systems (28) propulsion and energy (884) -> gas engines (329) -> ignition systems (28)  
    lubricators (2) propulsion and energy (884) -> gas engines (329) -> lubricators (2)  
    radial gas engines (1) propulsion and energy (884) -> gas engines (329) -> radial gas engines (1)  
    rotary gas engines (6) propulsion and energy (884) -> gas engines (329) -> rotary gas engines (6)  
    starters (4) propulsion and energy (884) -> gas engines (329) -> starters (4)  
    valves (9) propulsion and energy (884) -> gas engines (329) -> valves (9)  
  propulsion pumps (1) propulsion and energy (884) -> propulsion pumps (1)  
  steam apparatus (277) propulsion and energy (884) -> steam apparatus (277) exclude
    boilers (139) propulsion and energy (884) -> steam apparatus (277) -> boilers (139) exclude
      pumps (3) propulsion and energy (884) -> steam apparatus (277) -> boilers (139) -> pumps (3)  
    oscillating steam engines (3) propulsion and energy (884) -> steam apparatus (277) -> oscillating steam engines (3)  
    portable steam engines (3) propulsion and energy (884) -> steam apparatus (277) -> portable steam engines (3)  
    rotary steam engines (41) propulsion and energy (884) -> steam apparatus (277) -> rotary steam engines (41)  
    safety valves (7) propulsion and energy (884) -> steam apparatus (277) -> safety valves (7)  
    steam carriages (2) propulsion and energy (884) -> steam apparatus (277) -> steam carriages (2)  
    steam pumping engines (2) propulsion and energy (884) -> steam apparatus (277) -> steam pumping engines (2)  
    steam pumps (21) propulsion and energy (884) -> steam apparatus (277) -> steam pumps (21)  
    steam stills (43) propulsion and energy (884) -> steam apparatus (277) -> steam stills (43)  
    steam traction engines (15) propulsion and energy (884) -> steam apparatus (277) -> steam traction engines (15)  
    steamboats (14) propulsion and energy (884) -> steam apparatus (277) -> steamboats (14)  
  steam engines (260) propulsion and energy (884) -> steam engines (260) exclude
    brakes (1) propulsion and energy (884) -> steam engines (260) -> brakes (1)  
    check valves (2) propulsion and energy (884) -> steam engines (260) -> check valves (2)  
    cylinders (2) propulsion and energy (884) -> steam engines (260) -> cylinders (2)  
    governors (14) propulsion and energy (884) -> steam engines (260) -> governors (14)  
    pistons (5) propulsion and energy (884) -> steam engines (260) -> pistons (5) exclude
      piston ring and packing (4) propulsion and energy (884) -> steam engines (260) -> pistons (5) -> piston ring and packing (4)  
    stuffing boxes (1) propulsion and energy (884) -> steam engines (260) -> stuffing boxes (1)  
    valve gear (19) propulsion and energy (884) -> steam engines (260) -> valve gear (19)  
    valves (7) propulsion and energy (884) -> steam engines (260) -> valves (7)  
  water power (26) propulsion and energy (884) -> water power (26) exclude
    water wheels (26) propulsion and energy (884) -> water power (26) -> water wheels (26) exclude
      turbine water wheels (2) propulsion and energy (884) -> water power (26) -> water wheels (26) -> turbine water wheels (2)  
 
Full Hierarchy | abrasives and holders (4) | adzes (8) | agricultural machines (1,556) | agricultural tools (128) | armaments (54) | axes (95) | braces (292)
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handsaws (1,007) | household machines (186) | household tools (618) | household (798) | industrial machines (228) | industrial tools (136) | knives and cutters (117) | layout tools (2,393)
machinist tools (511) | metalworking machines (2,749) | miter boxes (168) | planes (700) | pliers (531) | potters tools (3) | propulsion and energy (884) | punches (19)
rules (402) | scrapers (46) | screwdrivers (414) | shaves (77) | specialty machines (757) | specialty tools (76) | stoneworking machines (44) | structures (5)
tool handles (78) | tool holders (63) | tool making (237) | tool storage (47) | trade specific (4,792) | transportation machines (66) | transportation tools (9) | water distribution systems (44)
woodworking machines (13,736) | work holding (1,005) | wrenches (4,731)

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