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The original full name of BTH was in fact: British Thomson-Houston, although nearly no one calls them that, & in print in nearly every parts book I own it is shortened to BTH, and I guess if one wants to get technical, the company name was sold & its new owners call themselves "BTH Components LTD." and also hold all rights & logos . Speaking of logos, if you look at the BTH logo (or BT-H if you choose) you will see a circle with 3 "curls" on its inside. Look familiar? Thats because BTH was a subsidiary of the American company GE (General Electric).