USD310219SExpiredUtility

Master unit for an intercommunication system

83
Assignee: TUNSTALL TELECOM LTDPriority: May 13, 1987Filed: Nov 12, 1987Granted: Aug 28, 1990
Est. expiryMay 13, 2007(expired)· nominal 20-yr term from priority
Inventors:Martin F. Carlile
83
PatentIndex Score
35
Cited by
7
References
1
Claims

Claims

exact text as granted — not AI-modified
The ornamental design for a master unit for an intercommunication system, as shown.

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