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3900971
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Information
Patent Grant
3900971
References
Source
Patent Number
3,900,971
Date Filed
Not available
Date Issued
Tuesday, August 26, 1975
48 years ago
CPC
B24B13/02 - by means of tools with abrading surfaces corresponding in shape with the lenses to be made
B24B13/043 - using cup-type grinding wheels
US Classifications
451 - Abrading
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