Dylan Constan-Wahl Trademarks
AUDION
Vacuum tubes for radios
Owned by: Dylan Constan-Wahl and Charles B Emmons
Serial Number: 88012632
DE FOREST
Thermionic tubes
Owned by: Dylan Constan-Wahl and Charles B Emmons
Serial Number: 88012636
ALTMANN
Sound recording and sound reproducing apparatus and instruments
Owned by: Dylan Constan-Wahl
Serial Number: 88012640
