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+++ 1970 r. Harman Kardon CAD-5 = world's 1st cassette recorder using a sound filter
++ 1970 .p. Motorola TM920S1 Quadraline - 1st (?) car quadro cart player
+++ 1967.t. Philips LGC2000
+++ 1978.a. Sharp RT-3388 first computer player
+ 1972.k. Akai GXC-65D
+++ 1987.g. Tesla transcriber 120
+++ 1987.h. Tesla Transcriber
+++ 1986.a. Nagra JBR PS-1
+++ 1967.s. Harman Kardon SC=2520 - world 1st 3 in 1 music centre
+++ 1951 c.c. Loewe Optaphon - world's first cassette with magnetic tape 
++ 1982 h. Shebro PB-1 - microcassette player + FM radio headset
dr. Karl Daniel - inventator si promotorul casetei fara sfarsit/endless cassette inventor & promoter
+ 1964.f.c Norelco compact-cassette -first model
J. Bardeen, W. Brattain, W.Shockley - transistor' inventors
sample of books relating audio domain