| 摘要 |
1. An electromagnetic decoder comprising a code wheel assembly including a base member, a shaft supported by the base member, a first wheel element and a second wheel element carried by the shaft, a plurality of code posts carried by the first wheel element and preset for locking the first and second wheel elements together in driving relation, selectively operable means carried by the base member for actuating the code posts sequentially in a predetermined sense for unlocking the first and second wheel elements, and means actuated by one of the wheel elements for performing a control function upon the first wheel element being unlocked from the second wheel element.
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