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++ 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
+++ 1971 (?).j. Continu-sound - endless cartridge
+++ 1982.g. Sony U-matic - digital profi audio cartridge
+++ 1983.j. Sony Betamax - digital profi audio cartridge
+++ 1967.r. Philips N2600 - 1-st european car compact-cassette(TM) player 
+++ 1944(?).a. RD-11B/GNQ-1 - military wire recorder/reproducer unit