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PCE
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Search for IPC and CPC classification codes or keywords
CPC Subgroup
G02B 27/04

having collapsible parts

Full Title

Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 > Viewing or reading apparatus (stereoscopic systems G02B30/00) > having collapsible parts