AP Radiotelefon started in 1951 founded by Anton Petersen. 

He was borne in Switzerland in 1927 and came to Denmark as a child - he started the company AP Radiotelefon(AP Radiophone) at the age of 24.

Here are a few pictures of the production at the factory in Hvidovre in Denmark near Copenhagen.

Article from Danish magazine "Radioten" about Anton Petersen and the becoming of TP Radio