1915:
Mears Ear Phone Co
The Mears Ear Phone Co. Aerophone Pilots Intercom
Rec. Num. 1 of 2
Source: Aeroplane November 3rd 1915
1915:
Mears Ear Phone Co.
The Mears Ear Phone Co. Aerophone Pilots Intercom
Rec. Num. 2 of 2
Source: Aeroplane December 29th 1915