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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
++ 1998?.a. adaptor caseta-CD/MP3/MD - cassette-CD/MP3/MD adaptor
++ 1973?.k. Binatone - stereo8 to compact-cassette adaptor
++ 1967.m. Muntz Porta Four PF-30
+++ 1972.h,a. SG-100 - world's first & smallest 3 in 1 audio portable device 
+++ 1972.h,b. SG-100 - world's smallest 3 in 1 audio portable device