'Other' Construction and Allied Systems Info & Downloads
Konstruktor Mekhanik(3) was a (probably) metric constructional system made mainly from aluminium. It was made in the Petrovsky Electromechanical Plant "Hammer", Petrovsk, Saratov Region, Russia (Петровского электромеханического завода «Молот», г. Петровск). It was later thought to be made by OJSC Tantal, Saratov (ОАО «Тантал» г. Саратов). It was made from at least the late 1970s to the mid 1980s.
Info from the Metal Constructional Systems Database for KONSTRUKTOR MEKHANIK 
Hole pitch <12.7mm
17 (see comment *1)
4.3 (see comment *2)
Bolts: round (slotted)
Steel with a Iridescent finish
(see comment *3)
Many parts similar to SONNEBERGER. *1 Mod 1.5. *2 Some holes in various parts 5.3 (instead of slotted holes). Nut plain aluminium.
Below there are manuals/leafets which can be downloaded by clicking on the appropriate image.
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