Refrigeration line size calculator

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Description

FIG. 1 is a front elevational view of a refrigeration line size calculator showing my new design;

FIG. 2 is a right side elevational view, the left side being the same;

FIG. 3 is a top plan view, the bottom being the same; and

FIG. 4 is a rear elevational view thereof.

Referenced Cited
U.S. Patent Documents
D104237 April 1937 Banta
2777617 January 1957 Matt
3533551 November 1968 Cole et al.
4121759 October 24, 1978 Merkel et al.
4308450 December 29, 1981 Ausman et al.
Foreign Patent Documents
1256635 February 1961 FRX
Patent History
Patent number: D289058
Type: Grant
Filed: Dec 13, 1984
Date of Patent: Mar 31, 1987
Inventor: Michael T. Alberts (Union Lake, MI)
Primary Examiner: Louis S. Zarfas
Application Number: 6/681,262
Classifications
Current U.S. Class: Slide Rule Type (D18/9)