For sale is a vintage ETR 328 variable inductor RF coil marked 6815. This 5-pin shielded electronic component features a top tuning slug and metal can housing. Untested, sold as is, likely New Old Stock. Approx 1/2 inch size.

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Keywords: advanced quantum theory, paul roman, physics textbook, addison-wesley, 1965, boston university, vintage science book, quantum mechanics