United States Patent RE28274

Publication Date:
12/17/1974
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Primary Class:
353/44
Other Classes:
359/538, 353/65, 359/540, 353/66, 359/452, 353/120
International Classes:
B29D11/00; B41M3/00; G02B5/128; G02B21/00; G03B21/06; G03B21/08; G03B21/132; G03B27/04; G03F7/34; G02B5/12; G03B27/02