US PATENT SUBCLASS 968 / 21-- .~ Driven by liquids or gases; liquid or gaseous drives or mechanically controlled secondary clocks (winding up by pneumatic means subclass 39; winding up automatically by wind power subclass 63; winding up by electrothermal or electro-pneumatic arrangements subclass 427; thermoelectric or thermo-pneumatic driving mechanisms subclass 495) [G04B 1/26]

US PATENT SUBCLASS 968 / 21
.~ Driven by liquids or gases; liquid or gaseous drives or mechanically controlled secondary clocks (winding up by pneumatic means subclass 39; winding up automatically by wind power subclass 63; winding up by electrothermal or electro-pneumatic arrangements subclass 427; thermoelectric or thermo-pneumatic driving mechanisms subclass 495) [G04B 1/26]

968 /	HD	HOROLOGY

2	DD	DRIVING MECHANISMS (driving mechanisms for Turkish time subclass 167; driving mechanisms in the hands subclass 396; driving mechanisms for phonographic apparatus G11B 19/00; springs, driving weight engines F03G; driving mechanisms for cinematography G03B 1/00; driving mechanisms; driving mechanisms for time fuses for missiles F42C; driving mechanisms for toys A63H 11/23) [G04B 1/00] {4}
21		.~ Driven by liquids or gases; liquid or gaseous drives or mechanically controlled secondary clocks (winding up by pneumatic means subclass 39; winding up automatically by wind power subclass 63; winding up by electrothermal or electro-pneumatic arrangements subclass 427; thermoelectric or thermo-pneumatic driving mechanisms subclass 495) [G04B 1/26] {1}
22	DD	.~.~> Clockwork systems working therewith (winding up electrical or mechanical clocks subclass 428; electrical clockwork installations subclass 524); winding [G04B 1/26B]