(Translated)
"The danish B&O microphone has all advantages !
The microphone housing itself is of pressed Beolit, which provides
much greater protection than f.e. marble.
Microphone noise has been taken to a minimum, achieved through
meticulous selection of carbon particles and the special process
they go through.
In short - B&O, the ideal of a microphone!"
Source:
Populær Radio
November 1935
Note that the prefix Beo... is already used here (!)
Martin