Can somebody enlighten me which are the "at least six"?
I count the two side brake versions (rotating and pivoting), the top mounted bolt brake version, the Canadian version, Victor B. That is only five.

I did not know that there was an electric driven version of the Berliner trademark type. I was not even aware that Berliner or Victor made any electric versions of their external horn machines. Would anyone be willing to share some information and maybe pictures?JohnM wrote:And the electric motor-driven model.