Oxford speaker dating
The President for those four decades was an Ohio native, Lawrence Heineman.
Permoflux was a Chicago based speaker company that started sometime in the thirties and was active into the seventies.
While researching the central focus of this website, Magnatone and Estey, quite often I happen across bits of information about some of their component suppliers.
This information is usually deep in old newspaper and magazine archives, and doesn't seem to be organized consisely anywhere in any form.
This likely marked the end of Magna Electronic's use of Permoflux speakers, although Heineman managed to re-organize Permoflux and open up a new facility in the summer of 1957, consolidating all operations to a new 31,000 square-foot facility in Glendale at 4101 San Fernando Rd.
The Oaktron Electronics Company was formed in 1950 in Tinley Park, Ill. Wesley for the purpose of manufacturing transformers, solenoids, thermostats, and other electronic assemblies under contract to other manufacturers. Rollins was a VP for Cresent Industries in Chicago, when he left to form Oaktron Industries in early 1954.
In the early fifties their premium line of speakers was the Royal Blue Line with Alnico-V magnets, with an advertised frequency response from 50cps to 12,000cps.