was the brand name of the J.W.B. Wireless Co. The company was located
on the addresses 19, Garrick Street, London W.C. 2,
310a-312a, Euston Road, Londen, N.W. 1. and Nelson Street Works,
Mornington Cresent, London, N.W. 1. The company made crystal
receivers (somtimes with matching valve amplifiers) from 1923
until about 1930.
On the right an advertisement for the first
crystal receiver, "The Brownie Wireless" from 1923.
The ad is from March 3rd, 1923 in Popular Wireless Weekly.
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