Document Type and Number:
Japanese Patent JPS5649510
Kind Code:
U
Application Number:
JP13269279U
Publication Date:
May 01, 1981
Filing Date:
September 26, 1979
Export Citation:
International Classes:
G03B23/00; G02B3/00; G02B6/04; G02B7/00; G02B7/02; (IPC1-7): G02B7/00; G02B5/172; G03B23/00
Domestic Patent References:
| JPS4018365Y1 | ||||
| JP50074946B |
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