Music laboratory

Details Music laboratory Music laboratory

1971-04-27

1977-03-08

Pinkham, Richard C.

35 5, 35 48R, 84470, G09B 1904

Patent

active

040105571

ABSTRACT:
A system of class intercommunication which provides:

REFERENCES:
patent: 2821580 (1958-01-01), Black
patent: 3177594 (1965-04-01), Demo
patent: 3200516 (1965-08-01), Parker
patent: 3217428 (1965-11-01), Spaulding
patent: 3470785 (1969-10-01), Shallenberger
patent: 3475833 (1969-11-01), Andersen
Oak Distributor Switches, Catalog, 6/1/62, pp. 1-6.

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