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