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I'm guessing they were shooting for 10 years. In the late 40s a huge percentage of the radios in use would have been from the mid-late 30s, and people tended to expect that. Lots of companies found they were overbuilding their sets, and it was costing their bottom lines. Even the cheapened sets of the mid 50s had little trouble reaching their 10th birthday with some maintenance.
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Bryan
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