Black jack slide rule

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Description

FIG. 1 is a front elevational view of a black jack slide rule showing my new design;

FIG. 2 is a right edge elevational view; and

FIG. 3 is a rear elevational view.

Referenced Cited
U.S. Patent Documents
2237873 April 1941 Barok
3231189 January 1966 Barham
3280788 October 1966 Robinson, Jr.
3718519 February 1973 Montgomery
Foreign Patent Documents
1178451 May 1959 FRX
Patent History
Patent number: D261399
Type: Grant
Filed: Oct 15, 1979
Date of Patent: Oct 20, 1981
Inventor: Robert G. Wagner (St. Paul, MN)
Primary Examiner: Louis S. Zarfas
Attorney: S. Pal Asija
Application Number: 6/84,939
Classifications
Current U.S. Class: Rotary (D18/10); D10/461
International Classification: D1999;