Vacuum tube voltmeter
US D180280 S
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"" Des. 180,280 Ce Patented May 14, 1957 United States Patent 0 VACUUM TUBE VOLTMETER William W. Hartz, Springfield, N. J., assignor to Weston Electrical Instrument Corporation, Newark, N. J., a corporation of New Jersey Application June 7, 1954, Serial No. 30,844
Term of patent 14 years (Cl. D265) The single figure is a perspective view of a vacuum OTHER REFERENCES tube voltmeter, showing my new design. The opposite side, not shown, is substantially the same as the side shown, and the back thereof is conventional. Portions of the figure are diagonally lined to indicate transparency.
The ornamental design for a vacuum tube voltmeter, substantially as shown and described.
References Cited in the file of this patent UNITED STATES PATENTS D. 84,890 Graft Aug. 18, 1931 D'. 161,931 Huber Feb. 13, 1951 D. 170,658 Rowell et al. Oct. 20, 1953 2,491,002 Domecki Dec. 13, 1949 Radios Master, 1953-4, 18th edition, page G-4, item WR-59C, Television Sweep Generator, and page 6-69, model 533DM.
Radios Master, 1954-5, 19th edition, (0) 1954, page 6-54, Weston Model 982 Vacuum Tube Voltmeter (issued in September-October according to Standard Rate and Data Service, January 22, 1955, page 943).