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Patents for Harold F. Armstrong
Patents 1 - 3 of 3
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PictureNumberDatePatenteeTitle
  3,250,155May 10, 1966H.F. ArmstrongRecessing Tool
  3,332,130Jul. 25, 1967H.F. ArmstrongCutting Tool
  3,550,230Dec. 29, 1970H.F. ArmstrongCutting Tool with Chip Breaker
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