Last month, while a company was working on replacing my home's attic insulation, they accidentally blew out the doorbell transformer. We only realized this much later and after the replacement, I kept the old transformer. And item turned out to be an ancient piece of equipment built in Los Angeles, California. Who knew that Los Angeles used to manufacture a legitimate electronic device that really last this long. How long did it last? The company, Inca (transformer), was established back in 1920s and sold to Phelps Dodge Corp in 1930s. So, it might be possible that this transformer lasted almost 100 years! 😲
If you do know when it could have been developed, let me know in the comment. So far, all I have seen from Inca is radio transformer. =)
- https://antiqueradios.com/forums/viewtopic.php?f=19&t=220795
- https://dbase1.lapl.org/webpics/calindex/documents/15/522985.pdf
- https://forums.qrz.com/index.php?threads/inca-transformers.627069/
- https://worldradiohistory.com/hd2/IDX-Site-Early-Radio/Archive-Radio-IDX/IDX/30s/Radio-1936-11-OCR-Page-0080.pdf
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