General Radio plug-in adjustable wavemeter coil, thick wire, 10 turns. No style or type number. Unit mounts on a General Radio 247 wavemeter. See image, Harold Greenwood, "Pictorial Album of Wireless ...
Estru honeycomb / lattice coil in original box, no mount. A commercial honeycomb type inductance coil for radio receiver. Green insulation, 1250 turns. Marked: "Estru / Type 1250 / Lattice Coil ...
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