Metal tools and implements – making – Blank or process – Keys
Patent
1983-11-09
1985-11-19
Parker, Roscoe V.
Metal tools and implements, making
Blank or process
Keys
70411, B21K 1300
Patent
active
045534527
ABSTRACT:
For producing security keys, in a first method step bore patterns differing from one another are produced, each bore pattern having the same number of bore locations. The corresponding bores are standard bores, which however may vary in terms of their bore depth. In a second method step, a prespecified number of selected bore locations in each bore pattern is varied in terms of their positions. In a third method step, each selected bore locations is additionally varied in terms of a prespecified number of bore shapes differing from one another.
REFERENCES:
patent: 3777520 (1973-12-01), Grepinsek
patent: 3788110 (1974-01-01), Sugae
patent: 3824818 (1974-07-01), Neale
patent: 4325241 (1982-04-01), Keller
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