+++ 1962(ca).k.c. Reditune - endless cartridge
++ 1956-9 Arvin Industries - Morse signal coder + decoder 
+++ 1971.e.c. Hipac - japanese endless cassette/cartridge inspired from Playtape
+++ 1988.k.c. Pocket Rockers - smallest endless cassette 
+++ 1964.e.c. 3M/Scotch Cantata 700 = greatest audio cassette
+++ 1967.m.c Muntz Mini-Twin Stereo pak MT-E106
+++ 1944(?).a.c. Cosmos Industries MX-303A/ANQ-1 - wire cart
+++ 1942 .a. Textophon BW4 I - first audio cassette-3rd variant 
+++ 1962-3.f.c. 3M(Scotch) type 270
+++ 1962 (?).e.c. caseta/casette Vity
+++ 1962.b.c. caseta/cassette Orrtronic Tapette
+++ 1963.b.c. caseta/cassette Cousino Echo-matic
+++ 1955.a.c. caseta/cassette Midgetape RL
+++ 1966.f.c. caseta/cartridge Playtape 
+++ 1964.c.c. caseta/cassette Sanyo Magazine