Casetofoane cu fir de otel si primele cu banda.
+++ 1942.a. Textophon BW4 I - first audio cassette-3rd variant 
+++ 1944(?).a. RD-11B/GNQ-1 - military wire recorder/reproducer unit
+++ 1944(?).a.c. Cosmos Industries MX-303A/ANQ-1 - wire cart
+++ 1947.a. RCA MI-12875 - first domestic cartridge recorder
+++ 1947.a.c. caseta/cartridge RCA MI-12877
++ 1948-50.a. Peirce Sound recorder RD-106/ANH-2
+++ 1950.b. Tefifon B51
+++ 1950.b.c. first endless cassette - caseta/cassette Tefi Schallband
+++ 1951(?).a. Peirce 265B - wire cartridge recorder
+++ 1951(?).a.c. caseta/cartridge Peirce 330
1951.b. Loewe Optaphon 51 WAP
+++ 1951.b. Loewe Optaphon 51 WAP - world's 1st cassette + record player mix 
+++ 1951 c.c. Loewe Optaphon - world's first cassette with magnetic tape 
+++ 1954.a. Mohawk Repeater MR/JR - first USA endless cartridge message player/repeater
+++ 1954.a.c. Mohawk Message Repeater Cartridge - 1st USA endless cartridge