Dokorder stands for Denki Onkyo, aka... NOT Denon (as I originally thought :) DENki ONkyo is a generic term meaning "electric sound". And, no, Dokorder wasn't related to Onkyo either !
Rare japanese brand known for loudspeakers and tape-based products which folded circa 1976/77, shortly after the 1140 was presented.
Luxman seemingly bought the Dokorder factory to expand its own actvities (ie. for the 5K50 and other cassette-based components) and Dokorder was finally acquired by Murata in 1982 - and Luxman by Alpine a year later. More probably, Alpine took over the Dokorder business and handled the new Lux recorders in that dedicated factory.
Before that, tiny Dokorder probably made its butter building for others...
The 1140 is big 3-motor, 3-head, solenoid-operated, 38cm/s studio deck.
Quarter-track only, though.