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| a mechanical device on a camera that opens and closes to control the time of a photographic exposure | ||||
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| a metal block in breech-loading firearms that is withdrawn to insert a cartridge and replaced to close the breech before firing | ||||
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| a mechanism that detonates the charge of a gun | ||||
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| a sliding bar in a breech-loading firearm that ejects an empty cartridge and replaces it and closes the breech |