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+++ 1982.e. Olympus L400 - smallest (micro)cassette recorder ever
+ 1980.j. Superscope CD-330
+++ 1942.a. Textophon BW4 I - first audio cassette-3rd variant 
++ 1972.h,c. National SG-100 = world's first & smallest portable 3 in 1 system
+++ 1969.j. Olympus Zuiko Pearlcorder - first world's ''microcassette'' (TM) 
++ 1967.k. Concord F-103/National RQ-231 = first japanese radiorecorder with ''compact-cassette'' (TM) 
+ 1972.j. National Panasonic SG-106F
1951.b. Loewe Optaphon 51 WAP
+++ 1962-3.f.c. 3M(Scotch) type 270
++ 1983. f. ITC Omega - Fidelipac cartridge recorder
+++ 1965.a. Grundig C100 - first DC cassette recorder
+ 1981.i. Fisher PH-M77
+ 1976.h. Philips N2520
++ 1974.c. Technics RS-630USD
1982.d. Philips LFH 0585