Donald Malcolm Harvey

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Automatic rangefinder and focusing apparatus

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Electronic flash apparatus for conserving flash battery life

Electric lamp and discharge devices: systems – Condenser in the supply circuit – Condenser in shunt to the load device and the supply
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Method and apparatus for treating elements of photographic film

Cleaning and liquid contact with solids – Apparatus – Sequential work treating receptacles or stations with means...
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Programmed exposure control apparatus

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Profile ID: LFUS-PAI-P-1192347

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