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| − | * | + | *On [[January 14|14th January]], [[1966/en|1966]] [[Hettich, Hugo|Hugo Hettich]] applied for a Patent for an Electical Clock with a self-winding, periodic, electromagnetic, feedback drive mechanism. |
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Version vom 14. August 2011, 23:31 Uhr
| 1965 << 1966 >> 1967 |
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- On 14th January, 1966 Hugo Hettich applied for a Patent for an Electical Clock with a self-winding, periodic, electromagnetic, feedback drive mechanism.