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Communication device
US 3,022,878 A
Filed
: 01/11/1960
Issued
: 02/27/1962
Est. Priority Date
: 01/11/1960
Status: Expired due to Term
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Current Assignee
Rochester, Nathaniel
,
Seibel, Robert
Original Assignee
Rochester, Nathaniel
,
Seibel, Robert
Inventors
Seibel, Robert
,
Rochester, Nathaniel
Application Number
US04/001,768
Time in Patent Office
778 Days
Field of Search
US Class Current
400/479
CPC Class Codes
A61F 4/00
Methods or devices enabling...
B41J 5/10
Arrangements of keyboards ,...
G06F 3/0235
using chord techniques G06F...
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