Historical Document · 1985

US Patent 4,529,322: Booster Circuit for Electronic Watch Elements (Seiko Instruments)

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One boosting coil for both an EL lamp (about 100 V at 1,024 Hz) and a piezo buzzer, from a 1.57 V cell; granted 16 July 1985.

Author

Makoto Ueda

Year

1985

Type

Historical Document

Credit

US Patent and Trademark Office; via Google Patents.

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