King 4 track continuous.
Telefunken 2.0 ips cassette
Garrard 1/4" tape, Cassette Deck
Sony 1/4" tape, hi-fi cassette
The PYE recordable 45 rpm record.

The road to the cassette as we knew it was a tortuous one, and Philips had to give the patent away to get it out of the bin. They didn't do much better with the V2000 video recorder: 2 sided, a real lemon - pity, because they were first on the market in video with a format that I can't remember the name of!