[GreenKeys] Fernschaltgerät NL

[Håken Hveem]

Does anyone have a "Fernschaltgerät NL" in working order?
I can also use any other Fernschaltgerät , e.g. military version T56, 
for a Siemens T-100 with paper perforater and reader?

I wonder if anyone has designed a modem , with functions like loop 
supply, Telex PABX, tone or pulse dealing, RS232 input/output ( so it is 
possible to use bill buzbees heavy metal ) ?