Sabamobil

Sabamobil was a magnetic tape audio cartridge format made by SABA that came to the market in 1964.

The cartridge could be opened without the need of any tools by removing two holding clamps.

The model TK-R12 also had an builtin medium frequency AM-broadcast receiver and could also be operated portable with five D-type batteries.

It appeared in the following year of the introduction of the Compact Cassette[3] and lost its market shares soon to 8-track and Compact Cassette, which both came in smaller cartridges.

A similar technique to reuse standard 3-inch reels was the design of the dictation machine Philips Norelco EL3581, but with rearranged tracks and slower tape speed.