In November 1953 the following transistors were
available for commercial use only (all point-contact-transistors ) :
GSN1 and GSN2 from the INTERMETALL. .
GT10, GT20 and GT30 from the Dr. Rost Labs.
VS200, VS220 and VS221 from S.A.F. Co.
TS13 and TS33 from SIEMENS Co. The SIEMENS
devices were cartridge cases. It seems quite possible that they never
produced any point-contact devices on their own (like TELEFUNKEN) but
instead sold US transistors that had been “re-labeled“ to their types TS13
and TS33. They looked like the early cartridges from Western Electric.
These SIEMENS devices never appeared in German literature as a photo but
only as a drawing.
TELEFUNKEN never presented any transistor devices to
the public until the end of 1953 as well. However, some point-contact
samples have shown up from former employees which took these as a souvenir.