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tool grinding and lapping machine

US1422505A US42337120A US1422505A US 1422505 A US1422505 A US 1422505A US 42337120 A US42337120 A US 42337120A US 1422505 A US1422505 A US 1422505A Authority US United States Prior art keywords plate lapping blocks plates machine Prior art date 1920-11-11 Legal status (The legal status is an assumption and is not a legal conclusion.

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