UNIDADE DE FILME

Perfections introduced in a film unit, comprising a photosensitive sheet and a second sheet, permanently secured to each other in superposed relation by spacer means extending along opposite side edges of the sheets and between them, characterized in that the spacer means they extend from between th...

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Bibliographische Detailangaben
Hauptverfasser: BOREL R, FAHNESTOCK TONE F
Format: Patent
Sprache:por
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