(579720) +++ 1963.a. Philips EL3300 - world's first "compact-cassette"recorder - the classic starting point of "cassette" era
(355260) +++ 1956.d. Dictaphone Dictet MPA = world's 1st transistorised pocket tape recorder
(186526) +++ 1958.b.c. caseta RCA Sound Tape Cartridge - 1st stereo cartridge
(165697) +++ 1942 .a. Textophon SP1/I - first audio cassette-3rd variant 
(138990) +++ 1971.c. Uher CR-124 - primul si cel mai mic HIFI autoreverse portabil - first and smallest portable HIFI & autoreverse
(128004) +++ 1964.a.c. caseta/cartridge RCA 8 piste/8-track
(120000) +++ 1966.e. Philips/Norelco 22RL962 = world's 1st radiorecorder with compact-cassette
(117419) +++ 1950.b.c. first endless cassette - caseta/cassette Tefi Schallband
(114038) +++ 1944 a.c.2. Brush VRW-1 - US Marine wire cartridge
(105534) +++ 1967.t. Philips LGC2000 - 1-st european functional music' player
(101977) +++ 1972.d. Philips 22RR800 = world's 1st portable radio-recorder using sound filter; 1st european portable stereo r-r
(100568) ++ 1969.m. National RQ-210 S
(76184) +++ 1967 .q. Grundig DeJur Mini-Memo /EN7
(75408) +++ 1957.b. caseta/cartridge Fidelipac (NAB)
(67521) +++ 1947.a. RCA MI-12875 - first domestic cartridge recorder