...
VA - Varian
...
VC - Victory
...
TG - Triange
...
VK - Viking
...
TD - Teledyne
...
VE - Vernitron
...
SB - Sunbank
...
TH - Theim
...
SV - Spectrol
...
TN - Technitrol
...
SR - Stalmetrics
...
TE - Technipower
...
SG - Singer
...
SO - Solitron
...
SL - Siliconix
...
SQ - Semtech
...