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In 1909 there is a report of two Providence wireless companies filling Navy contracts, Prague Electric Company from Providence and Massie Wireless Telegraph Company 2. Also in 1909 there were some interesting ads for Prague in the Providence Journal:
Providence Journal March 31, 1909.
Providence Journal April 4, 1909.
This ad ran repeatedly in the
Providence Journal from March 31, 1909 to May 26, 1909.
The McGraw Electrical Directory in 1910 their address is listed as 107 Westminster Street in Providence 5. In 1911 they are listed in the Electrical Record as making X-Ray Outfits 7.In 1914 there is a listing of some of their equipment in the book Wireless Telegraph Construction for Amateurs 1 by Alfred Powell Morgan. Also in 1914 there are listings for Prague making Wireless equipment and pottery bases for lamps 3
In in 1915 6 & 1916 4 they were listed as just making X-Ray equipment.
By Alfred Powell Morgan
D. Van Nostrand Company
1 Wireless Telegraph Construction for Amateurs
2 Electrical Review Volume 54, 1909
3 Electrical Record and Buyer's Reference, Volume 16, 1914
4 Electrical Review and Western Electrician, 1916
5 McGraw Electrical Directory, 1910
6 Electrical Review and Western Electrician, 1915
7 Electrical Record, 1911