Later (1950's) miniature tube plant in Long Island, New York.
[This is where the US made 6922 and 7308 were manufactured.]

Ladies in low dust [clean room] smocks skillfully assembling tube cages.

Technician tweaks the sealex (exhaust & sealing machine).

Here is a true "state of the art" first class facility imported from Holland.
[Actually, the entire inside of the building was imported from Holland
including the office furniture according to my sources.]