US PATENT SUBCLASS 968 / 504
.~ The power supply being a radioactive or photovoltaic source [G04C 10/02]


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968 /   HD   HOROLOGY

503  DD  ARRANGEMENTS OF ELECTRIC POWER SUPPLIES IN TIMEPIECES (circuits subclass 888; mounting, assembling of components of electromechanical watches subclass 452, of electronic watches subclass 877) [G04C 10/00] {2}
504.~ The power supply being a radioactive or photovoltaic source [G04C 10/02]