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camerawiki: Asanuma catalogue (Oct. 1941): Auto Semi Minolta
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camerawiki: Asanuma catalogue (Oct. 1941): Promar lens scheme
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camerawiki: Asanuma catalogue (Oct. 1941): Promar lens description
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camerawiki: Foca-Finder C-50 (1)
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camerawiki: Foca-Finder C-50 (2)