Cassette tapes are produced of a polyester type plastic celluloid with a magnetized coating. The gamma ferric oxide (Fe2O3) was the basis of the original magnetized stuff. About 1970, a doping cobalt volume procedure with a double-coating method to heighten overall tape output levels was developed and introduced by 3M company.
The world of information
life cycle management
Marcel Duchamp
exercising during pregnancy
Kasimir Malevich
No comments:
Post a Comment