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+++ 1958.a.c.- caseta/cassette pt/for Saba TKR15 radiorecorder
++ 1971(?).f. Norelco 3170 - first Philips (USA) stereo portable radiorecorder 
++ 1970.n. Sony CF-100 - first Sony radiorecorder
++ 1956-9 Arvin Industries - Morse signal coder + decoder 
+++ 1970.m. Sanyo M-8 Cartridge Corder
++ 1948-50.a. Peirce Sound recorder RD-106/ANH-2
+++ 1963 a.c. Philips EL 1903 - first compact-cassette(TM) model
Valdemar Poulsen - magnetic wire recording' inventor
sample of books relating audio domain
J. Bardeen, W. Brattain, W.Shockley - transistor' inventors
Sony - official catalogs 1966-2008
Fritz Pfleumer - magnetic tape' inventor 
Allied electronics + Lafayette radio electronics = sample of distributors catalogs 1953-1974
Panasonic, Technics official annual catalogs - 1966-2010
Philips official annual catalogs 1962-2010