Notable Residents Ralph R. Batcher Ralph R. Batcher, Electronic Research Engineer is the inventor of the SLF (Straight Line Frequency) Condensor. He is also the author of: Radio Tubes, International Textbook Co., 1942 with Albert Hodges The Electronic Engineering Handbook, Electronic Development Assc., 1944 with William Moulic The Electronic Control Handbook, Caldwell - Clementys, 1946 with William Moulic Mr. Batcher resided at 240-02, 42nd Avenue (Poplar Street) during the 1940s through the 1960s.