Grundig C 100 and the early history of the Compact Cassette

DC-International - Wikiwand

C100 R-Player Grundig Radio-Vertrieb, RVF, Radiowerke, build

greatbear blog posts: audio tape

DC International Grundig C100L, repair to component level.

Boombox nomenclature

Grundig C210 Automatic

greatbear blog posts: audio tape

1965 Grundig C100 Cassette Recorder

Grundig History From The Foundations To Present

VHS, The JH Movie Collection's Official Wiki

Did the cassette tape undergo any significant design changes between when it was invented in the 1960s and today? - Quora