“?????????????????” ????????? ????? ?????????? ????????????????????????????????????????????? ????????????????????????????????????????????:??????????????? ?????? ???????????? ???????!!?????????? ??????? ????????? ??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????

?????????????????????????????????????????????? ????????????????????????????????????????? ?????????????????????????????????????????????????????????????????? ??????????????????????????????????????????????????????????????????????????????????????? ????????????????????????????????????????????????????????????????????? ????????????? ??????????????????????

??????????????????????????????????????????????????????????????????????????????????????????????????????????????? ?????? ?????“????????????????????????” ???????????????????? ??????????? (????????????)?????????????? : ????????????????????? ???????????????????? ????????????????????????????????, ????????????????????????? ?????????????????????????? ?

While in the early 1970s, educational recordings ended up amid the first commercial items marketed on cassette.[9] There were 8 organizations distributing elements on cassette with titles for instance Taking care of and Advertising Providers (12 cassettes, $300) and Govt Seminar in Seem with a number of sixty-minute cassettes.[9] In libraries, most

????????????? ?????????????????????? (????????????)???????????????????????????? (????????????)In 1955, a German inventor launched the Sound Book cassette system based on the Tefifon structure where by in lieu of a magnetic tape the seem was recorded over a constant loop of grooved vinylite ribbon much like the old 8-keep track of tape.?????????????