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    Prior art keywords shaft grinding block ring lens Prior art date 1930-12-31 Legal status The legal status is an assumption and is not a legal conclusion

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    WITN R F WILLIAMS v LENS GRINDING MACHINE APPLICATION FILED 11111 16 1910 VIn Patented sept 20 1910 5 SHEETS-BHEET l fem

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    A machine for selectively grinding the peripheral edges of both glass lens materials and plastic lens materials to a predetermined size and shape includes