Click on the pictures if you wish to be bored by more trivia about the set.

Late 40's? AVO Electronic Test Unit	c1957 Airmec RadiVet	Airmec TeleVet
c1960 Advance 77A	Airmec 314	Tektronix 575 Tr*ns*st*r Tester
1960's Advance 77B	Late 60's Bemex Pattern Gen.	c1965 Hewlett Packard 8551A

The service manuals for a number of these items can be downloaded
from the service data page.