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Internal-combustion engines

Subclass of: 123 - Internal-combustion engines

Deeper subclasses:

123001000 - MISCELLANEOUS (16)
123002000 - COMBINED DEVICES (39)
123200000 - ROTARY (33)
123018000 - OSCILLATING PISTON (4)
123021000 - CONVERTIBLE CYCLE (1)
123025000 - WATER AND HYDROCARBON (16)
123253000 - PRECOMBUSTION AND MAIN COMBUSTION CHAMBERS IN SERIES (12)
123294000 - COMBUSTION CHAMBER MEANS HAVING FUEL INJECTION ONLY (45)
123027000 - BURNING BY HIGHLY COMPRESSED AIR (6)
123041000 - REVERSIBLE (1)
123410010 - COOLING (146)
123410860 - CRANKCASE VENTILATION (9)
123042000 - OSCILLATING CYLINDER (1)
123045000 - ROTARY RECIPROCATING PISTON (3)
123046000 - FREE PISTON (6)
123047000 - VALVED PISTON (1)
123048000 - ADJUSTABLE COMBUSTION CHAMBER (29)
123051000 - MULTIPLE PISTON, COMMON NONRESTRICTIVE COMBUSTION CHAMBER (6)
123520100 - MULTIPLE CYLINDER (29)
123000000 - DOUBLE-ACTING (2)
123064000 - SIX-CYCLE (3)
123065000 - TWO-CYCLE (33)
123306000 - MEANS TO WHIRL FLUID BEFORE, UPON, OR AFTER ENTRY INTO COMBUSTION CHAMBER (7)
123310000 - COMBUSTION CHAMBER HAVING MULTIPLE SPARK GAPS (1)
123311000 - FOUR-CYCLE (3)
123319000 - ENGINE SPEED REGULATOR (101)
123406110 - SPARK IGNITION TIMING CONTROL (60)
123429000 - COMBUSTION CHAMBER MEANS COMBINED WITH AIR-FUEL MIXTURE FORMING MEANS (1)
123434000 - CHARGE FORMING DEVICE (E.G., POLLUTION CONTROL) (667)
123594000 - HIGH TENSION IGNITION SYSTEM (36)
123900100 - POPPET VALVE OPERATING MECHANISM (437)
123143000 - IGNITERS (48)
123192100 - VIBRATION COMPENSATING DEVICE (24)
123197100 - TRANSMISSION MECHANISM FROM PISTON (24)
123179100 - STARTING DEVICE (65)
123184210 - INTAKE MANIFOLD (101)
1231425R0 - WITH HEATING MEANS (6)
123657000 - COMBUSTION CHAMBER (4)
123193100 - PARTICULAR PISTON AND ENCLOSING CYLINDER CONSTRUCTION (68)
123188100 - VALVE (24)
123195000 - FRAME CONSTRUCTION (32)
123196000 - LUBRICATORS (39)
123198000 - ACCESSORIES (29)