-
	®Lorenz Dailygraph	®Armour Model 50	®Fredrick Hart & Company	®Radiotechnic Lab Model
	1931	(Military Model: 13-A-3-D)	Model RD-11B/GNQ-1	20N-DS Device 13-A-3-C
		1943	1944	1945
	®Magnecorder	®Webster-Chicago Electronic	®Webster-Chicago	®Magnetic Corporation of
	Model SD-1	Memory Model 80-1	Model 78-1 Wire Recorder	America Dictascriber 135
	1946	1947	1947	1948
	®Telemaster Telephone	®Webster-Chicago Model	®Webster-Chicago Model	®Webster-Chicago Model
	Answering Machine	180-1 Wire Recorder	181-1B Wire Recorder	228-1 Wire Recorder
	1948	“Electronic Memory”	“The Studio Model”	“Electronic Memory”
		1949	1950	1951
	®The Minifon “Special”	®The Minifon “P55”
	1955	1955