| http://www.w3.org/ns/prov#value | - ive one of series of exposure times to be set in said shutter represented in terms of2.sup.n where n is an integer, and a selector circuit, said shutter opening means being so connected to said electric source that it is actuated simultaneously with the energization of said binary counter circuit thereby opening said shutter, saidselector circuit being connected to said shutter closing means and a
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