User:C8H20N+/sandbox

The Recordon is a magnetic disk sound recording technology that was produced as an office Dictation machine. It was created in 1948 by Thermionic Products Ltd, and used a 9" paper disk with a magnetic coating . The paper disk could be folded and posted  along pre-printed fold lines . The system used a pre-grooved disk to keep the paper disks flat, and guide the recording/playback head over the disc . They were designed to be low cost and reusable, and Discs were erased either with the eraser bar which erased the while disk, or recorders could erase portions of the recording.

A number of accessories were available for the machine, including a foot pedal (model TP-930), Typists' headphones (TYPIST'S FEATHER-WEIGHT RECEIVER, model TP-947) and Typist's food switch (model TP-969).

Security Features
Thermionics advertised a protection mechanism called a "Codit Scroll", a device designed to Encrypt the recording, which could then be Decrypted during playback with the use of a similarly coded device.

Patent status
Labels on the Recordon player/Recorders indicate that patents were pending in multiple countries, and numerous patent applications were filed by Thermionic Products Ltd in several countries from 1948. while some patents were granted, it is unclear what elements of the system these covered.