Set including Mars patented France Etranger folding theater - Lot 216

Lot 216
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Set including Mars patented France Etranger folding theater - Lot 216
Set including Mars patented France Etranger folding theater binoculars (worn - W. 10 cm - D.: 6.2 cm) and a Kaufmann SGDG patented posograph in its case (14 x 9.8 cm - wear and accident to case). Note: The posograph was patented on October 8, 1921. Developed by Auguste Robert Kaufmann, the posograph was designed to determine the exposure time for photography.
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