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 an edge view looking from the left with respect to FIG. 1;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is an edge view looking from the right with respect to FIG. 1; and

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

Referenced Cited
U.S. Patent Documents
1728491 September 1929 Janneson
2812905 November 1957 Bachmann
3257075 June 1966 Nayman
3643070 February 1972 Dogigli
Foreign Patent Documents
1114917 May 1968 GBX
Patent History
Patent number: D253114
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: 5/857,864
Classifications
Current U.S. Class: Slide Rule Type (D18/9)
International Classification: D1999;