Theft-prevention screw fastenings

Details Theft-prevention screw fastenings Theft-prevention screw fastenings

1974-05-13

1977-06-07

Parsons, Jr., Marion

Bridges

85 45, 81 90C, 145 50A, B25B 1500, F16B 2300

Patent

active

040275728

ABSTRACT:
A nut or bolt which requires a special tool for its removal. The engaging element of the nut or bolt and the manipulating tool consisting of matching dowel holes, and pins which also function as keys, the pins and dowel holes being arranged in a random pattern.

REFERENCES:
patent: 641191 (1900-01-01), Champion
patent: 1447564 (1923-03-01), Norlund et al.
patent: 2316695 (1943-04-01), Jaffa
patent: 3140625 (1964-07-01), Pannozzo
patent: 3412635 (1968-11-01), Chmielewski
patent: 3519979 (1970-07-01), Bodensdein

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