Metric converter slide rule

- Hasbro Industries, Inc.
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Description

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

FIG. 2 is a top edge view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a bottom edge view thereof; and

FIG. 5 is an end view thereof both ends being the same.

Referenced Cited
U.S. Patent Documents
D196069 August 1963 Augustin
1875927 September 1932 Keuffel
Foreign Patent Documents
816969 August 1937 FRX
Patent History
Patent number: D253115
Type: Grant
Filed: Dec 5, 1977
Date of Patent: Oct 9, 1979
Assignee: Hasbro Industries, Inc. (Pawtucket, RI)
Inventor: William Hackemann (Shelbyville, TN)
Primary Examiner: Louis S. Zarfas
Attorney: Elliot A. Salter
Application Number: 5/857,865
Classifications
Current U.S. Class: Slide Rule Type (D18/9)
International Classification: D1999;