Mathematical aid

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Description

FIG. 1 is an isometric view of the mathematical aid showing my new design;

FIG. 2 is an enlarged front elevational view thereof;

FIG. 3 is an enlarged side elevational view thereof;

FIG. 4 is an enlarged top plan view thereof;

FIG. 5 is an enlarged bottom plan view thereof.

Referenced Cited
U.S. Patent Documents
D150506 August 1948 Blanc
667397 February 1901 Jones
2471271 May 1949 Green
Patent History
Patent number: D262892
Type: Grant
Filed: Jul 2, 1979
Date of Patent: Feb 2, 1982
Inventor: Burton S. Heiko (Jericho, NY)
Primary Examiner: Lester L. Lee
Attorney: Burton S. Heiko
Application Number: 6/54,303
Classifications
Current U.S. Class: Movable Indicator Or Changeable Exhibitor (D19/64); Demonstrator Or Exhibitor (10) (D19/62)
International Classification: D1907;