Metal tools and implements – making – Blank or process
Patent
1987-07-21
1989-01-03
Parker, Roscoe V.
Metal tools and implements, making
Blank or process
72104, B21K 156
Patent
active
047948213
ABSTRACT:
A method of roll forming a skip threading tap by plastic deformation of metal.
REFERENCES:
patent: 2656740 (1953-10-01), Bedker
patent: 2873634 (1959-02-01), Moeltzner
Parker Roscoe V.
Shanghai Bicycle Factory
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