Manufactor codes for german mine horns WWI

[Diesel]

Hello

I could use some help with manufactor codes on two german hertz horns. I have loked for a list, but haven't found one.

I have two for the moment, "ab" and "ag"

Regards
Joern

 

[Tmine35]

ab is Mundlos, ag is August d. Haer.

 

[Yodamaster]

Tmine35 is full correct !
ab : Mundlos Aktien Gesellschaft, Nähmaschinenfabrik, Magdeburg-N
ag : Haer Aug., Metaalwarenfabrik Anstalt, Troisdorf


Yoda

 

[Diesel]

Hello both

Thanks for the quick response.

Regards
Joern