DEC VT52 Terminal
By Xah Lee. Date: .
DEC VT 52, introduced in 1975.
DEC VT52 terminal
image source
DEC VT52 keyboard
DEC VT52 Manual
EK-VT52-MM-002_maint_Jul78_5f208.pdf
DEC VT78
DEC VT78 terminal. (it uses the same keyboard and housing as VT52)
(img src http://pdp8.co.uk/pdp-8-models/vt78/)
DEC VT78 terminal keyboard.
(source: [Comments on the Keyboard of the IBM PC By John J G Savard. At http://www.quadibloc.com/comp/kyb03.htm , accessed on 2013-03-21 ])