Title:
Process of making fused bifocal lenses
United States Patent 1483509

Inventors:
Bugbee, Lucian W.
Publication Date:
02/12/1924
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Assignee:
FRANKLIN OPTICAL COMPANY
Primary Class:
65/39
Other Classes:
65/17.600, 65/37
International Classes:
C03B23/22; C03B23/00