Private branch exchange
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The broken line showing of private branch exchange is included for the purpose of illustrating environment and forms no part of the claimed design.
Claims
I claim the ornamental design for a private branch exchange, as shown and described.
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Type: Grant
Filed: Feb 29, 2008
Date of Patent: Apr 5, 2011
Assignee: Panasonic Corporation (Osaka)
Inventor: Toshihiro Nakashima (Kadoma)
Primary Examiner: Ian Simmons
Assistant Examiner: Charles D Hanson
Attorney: Brinks Hofer Gilson & Lione
Application Number: 29/304,395