Date: | 1970s–1980s |
Material: | Iron oxide on polyester tape; plastic sheel, metal hardware |
Dimensions: | 0.15 in. (3.81 mm) tape; plastic shell, metal hardware |
Company: | Mann Endless Cassette Industries |
Location: | San Francisco, California, USA |
Used for "on-hold" music and messages, as well as for repeating presentations.