Master unit for an intercommunication system

- Tunstall Telecom Limited

FIG. 1 is a front and right side perspective view of a master unit for an intercommunication system showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a rear elevational view thereof; and

FIG. 7 is a bottom plan view thereof.

Referenced Cited
U.S. Patent Documents
D274518 July 3, 1984 Doodson
D291888 September 15, 1987 Fong et al.
D292401 October 20, 1987 Lee et al.
D292706 November 10, 1987 Fischer
D300631 April 11, 1989 Culbertson
D301037 May 9, 1989 Matsuda
Other references
  • CQ The Radio Amateur's Journal; Nov. 1986; p. 33; Sony AIR-8.
Patent History
Patent number: D310219
Type: Grant
Filed: Nov 12, 1987
Date of Patent: Aug 28, 1990
Assignee: Tunstall Telecom Limited (Whitley Bridge)
Inventor: Martin F. Carlile (Doncaster)
Primary Examiner: Theodore M. Shooman
Law Firm: Darby & Darby
Application Number: 7/120,089