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3816997
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Information
Patent Grant
3816997
References
Source
Patent Number
3,816,997
Date Filed
Not available
Date Issued
Tuesday, June 18, 1974
50 years ago
CPC
B24D7/14 - Zonally-graded wheels Composite wheels comprising different abrasives
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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