Thats PLC Center / Radwell - they have been around for aeons, used to be mail order with huge catalogues listing buy / sell / repair prices for every bit of industrial automation / PLC / computer part (they buy surplus stores from companies). They were always very expensive as they relied on being just cheap enough for companies to buy from them to keep machines running rather than upgrading obsolete equipment. They have probably had those tubes in stock for 25 years as it is, or just got luck with an inventory buy out...
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