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For grins, here are a few pix of my 1920s Steinite xtal receiver. The xtal mount is fairly clearly shown in pix 2.
The patent date, IMHO does not really date your coil, as it is valid for 17 years after issue date... coil could have been made in the 20s, or it could have been used in the era of "spark gap" code transmissions in the teens.
jr
Last edited by jr_tech; 10-06-2013 at 01:48 AM.
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