National Union Radio Corporation

In October, 1929, a merger was announced. Marathon (Norther Mfg), Sonatron, Televocal, and Magnetron merge to become National Union Radio Corporation. 

All of these brands would be discontinued and remaining stock sold into surplus channels.

They have 5 tube plants, located at Chicago, and at Newark, Hoboken, and Union City, NJ, with a total capacity of from 75,000 to 100,000 tubes daily - far greater than any existing factory. - Radio Engineering, Oct 1929

This gives clues to not all the plants running equally, and Televocal was likely running at 10-12k per day, with the other pulling 15-20k/day production rates. -Chris Benson

Bibliography references:
  1. Radio Retailing, Jun-1929, pg. 267. From AmericanRadioHistory.com. Retrieved 30-Nov-2018. !
  2. Radio Broadcast, Dec-1929, pg. 123. From AmericanRadioHistory.com. Retrieved 30-Nov-2018. !

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