B41L 11/08
Apparatus for directly duplicating from hectographic masters in mirror image, i.e. "wet duplicators" for producing positive copies with rotary cylinders carrying the masters
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Edits on 15 Mar, 2022
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Edits on 8 Mar, 2022
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B41L 11/08
Apparatus for directly duplicating from hectographic masters in mirror image, i.e. "wet duplicators" for producing positive copies with rotary cylinders carrying the masters
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