| 摘要 |
A typewriter frame and keyboard of conventional type includes a rotating drum of di-electric material carrying a conductive helical strip with which any one of the keys may be selectively engaged to actuate a light emanating apparatus. A character aperture disc is mounted in axially spaced relation to the drum to transmit light along an angular path of travel to a light sensitive material supported on the drum when one of the keys is actuated.
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