Communication system for classroom use and the like

Details Communication system for classroom use and the like Communication system for classroom use and the like

G - Physics

09

B

363/6

G09B 5/12 (2006.01) H03D 3/04 (2006.01) H03G 11/00 (2006.01) H04B 1/04 (2006.01) H04B 1/16 (2006.01) H04B 1/38 (2006.01) H04B 5/00 (2006.01) H04J 1/20 (2006.01)

Patent

CA 895050

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