DC-International

DC-International is an analog audio cassette format developed by Grundig and marketed in 1965. DC is the abbreviation of "Double Cassette", as the cassette contained two reels; International was intended to indicate that, from the beginning, several companies around the world supported the format with suitable tape cassette recorders, recorded music cassettes and blank cassettes. Since DC-International did not compete effectively against the similar Compact Cassette, it was discontinued in 1967. In 1971, Grundig would later introduce a dictation cassette format known as Steno-Cassette. Unlike DC International, Steno-Cassette would become popular and widely used within Germany.

Starting in 1961, Philips (in conjunction with Grundig) began work in its Vienna tape production facilities, on a (HiFi)-compatible single-hole cassette. At the same time, a Philips team in Belgium developed a 2-hole cassette, under the name Pocket Recorder (later-named Compact Cassette). Philips' management finally gave preference to this development, but informed its partner Grundig rather late, which led Grundig - who received an offer to participate in the Pocket Recorder, to abandon the DC-International cassette it developed without further ado. This was based upon construction drawings of the compact cassette, which Grundig had taken after their negotiations with Philips.