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US D387,063 SGranted
Telephone key expansion unit
AssigneeSiemens Rolm Communications Inc.
InventorsStefan Hillenmayer, Ulrich Skrypalle, Wayne E. McKinnon, David E. Bryant, Mary E. Kingsbury, Erich C. Elkins, Doug A. Erwin
Life of this patent
Estimating the term…
Abstract
The abstract isn’t available for this document.
Claims1
The ornamental design for a telephone key expansion unit, as shown and described.