Grundig LF-generator TG20.
   Hewlett Packard,  Meetzender 608D, gesloopt.
   Hewlett Packard,  audio-oscillator 200AB.
   Hewlett Packard,  audio-oscillator 204D.
   Leader, Model LSG-10, Signal Generator.
   TECH, TE-20 Signal Generator.
   General Radio Company, UHF-Oscillator type 857-A
   Marconi TF2002B Signal Generator.