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<http://webisa.webdatacommons.org/379621121>	<http://www.w3.org/ns/prov#value>	"Patent US3999195 - Camera adjustable exposure control adapter - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More ??Sign inAdvanced Patent SearchPatentsAn adjustable exposure control adapter for cameras is described which includes a light producing source, such as a LED, which is mountable in juxtaposition to a photo cell forming part of the automatic exposure system of the camer" .