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History of the manufacturer  

Q. T. Light Company, The; East Orange, New Jersey

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Name: Q. T. Light Company, The; East Orange, New Jersey    (USA)  
Abbreviation: qt-light
Products: Model types

The Q. T. Light Company
138 Park Avenue
East Orange, New Jersey

Sometime in 1923-1924 The Q. T. Light Company changed their name to The Q.T. Radio Products Company.

Production: 1922 -
Q-T Light Co.;

Some models:
Country Year Name 1st Tube Notes
USA  23 Detector Amplifier Type 718 WD12   
USA  23 Receiver Type 79 WD12  The Q. T. Light Company Type 79 was identical to Radio Telephone Mfg. Co. RTM  Tuner ... 
USA  23 QT    


Further details for this manufacturer by the members (rmfiorg):

May 1923 Radio magazine advertisement page 54tbn_usa_qt_light_drycell_may23radio180k.jpg
January, 1922 The Trained Nurse and Hospital Review magazinetbn_usa_q._t._light_co._jan._1922_the_trained_nurse_and_hospital_review.jpg
November, 1922 Boy's Life magazine page 52tbn_usa_q._t._light_co._nov._1922_boy_scout_mag_p52.jpg