using mechano-optical means

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CPC
G04G9/067

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Parent Industries

GPHYSICS G04Horology G04GELECTRONIC TIME-PIECES G04G9/00Visual time or date indication means

Current Industry

G04G9/067using mechano-optical means

Industries

Patents Grantslast 30 patents

Information Patent Grant
1881818
- Patent number 1,881,818
- Issue date Oct 11, 1932
- G04 - HOROLOGY