From Camerapedia.org
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| Ibsor shutter with Thowe lens
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| Ibsor shutter with Thowe lens
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| Ibsor shutter with Thowe lens
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The Ibsor is a leaf shutter made since 1908 by the German company A. Gauthier in Calmbach (AGC).
The Ibsor shutter was replaced by the Prontor in 1935