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G04D—APPARATUS OR TOOLS SPECIALLY DESIGNED FOR MAKING OR MAINTAINING CLOCKS OR WATCHES
G04D7/00—Measuring, counting, calibrating, testing or regulating apparatus
G04D7/12—Timing devices for clocks or watches for comparing the rate of the oscillating member with a standard
G04D7/1257—Timing devices for clocks or watches for comparing the rate of the oscillating member with a standard wherein further adjustment devices are present
G04D7/1271—Timing devices for clocks or watches for comparing the rate of the oscillating member with a standard wherein further adjustment devices are present for the control mechanism only (from outside the clockwork)
G04D7/1285—Timing devices for clocks or watches for comparing the rate of the oscillating member with a standard wherein further adjustment devices are present for the control mechanism only (from outside the clockwork) whereby the adjustment device works on the mainspring
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FR987953D1943-05-121943-05-12Procédé et dispositif pour l'étalonnage des spiraux d'horlogerie
ExpiredFR987953A
(fr)