Few years ago, I happened to come across a strange machine, which looked like an electronic Teletype, but there was no punch tape mechanism or anything similar to it. A thought it must have been an externally attached device. After some research on the Internet, I found an answer to it. It is a device called burst encoder made in the GDR. There was a similar device in service in the Hungarian Army called R-014. However it only works in Teletype mode and could only send numbers. Luckily, there is lots of information about both devices on a Dutch webpage. Even the operating instructions may be found.