| 摘要 |
An electronically controlled camera shutter of the type in which exposure time is automatically controlled by an electronic circuit, in which the power switch of said circuit is controlled so as not to close when the shutter is set to operate for either bulb exposure or time exposure, whereby bulb and time exposures are performed by only mechanical elements of the shutter, by passing the electronic circuit, whereby use of the power source battery can be minimized.
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