US PATENT SUBCLASS 968 / 427
.~ By electrothermal or electro-pneumatic arrangements [G04C 1/00B]


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968 /   HD   HOROLOGY

426  DD  WINDING MECHANICAL CLOCKS ELECTRICALLY (winding mechanically subclass 23; electrical winding of spring-driven arrangements for gramophones G11B 19/20) [G04C 1/00] {5}
427.~ By electrothermal or electro-pneumatic arrangements [G04C 1/00B]