28420. (documents) U.S. Lighthouse Service, 11th District. Radiophone Tests and Equipment. 1929
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28420. (documents) U.S. Lighthouse Service, 11th District. Radiophone Tests and Equipment. 1929
28420. (documents) U.S. Lighthouse Service, 11th District. Radiophone Tests and Equipment. February 20, 1929. 4 pieces. Lot includes typed letter on Lighthouse Service stationery acknowledging assistance in evaluating signal strength and quality during recent radiophone tests conducted by Lighthouse Service radio station WWR. Document is signed by the Superintendent of Lighthouses, 11th District. Included is a second sheet describing the 50 watt crystal controlled transmitter, along with another printed photo of the equipment, which was constructed by Lighthouse Service personnel at the 11th District shops. Included also is the original mailing envelope with printed Lighthouse Service return address. Nice Lighthouse Service lot, good information. Clean, some wear. (VG). $65.