United States Patent RE27473

Publication Date:
09/05/1972
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Primary Class:
359/360
Other Classes:
428/215, 428/460, 428/436, 351/163, 427/166, 359/885, 428/213, 427/164, 427/160, 359/723, 351/44
International Classes:
G02B5/28; G02C7/10; G02C7/00