'Other' Construction and Allied Systems Info & Downloads
Konstruktor(16) was a construction system with similarities to Eitech, but no elongated holes in angle girders. It has a few unique parts. It was made in Russia by Moscow toy factory "Eaglet" (московский завод игрушек "Орленок") in the late 1980s.
Info from the Metal Constructional Systems Database for KONSTRUKTOR 
Hole pitch <12.7mm(probably)
1950s (some significant doubt)
Set 1 Tekhnik lid is orange with an 'exploded' Tractor on it; Set 2 Mekhanik lid is orange with a Lathe. Some parts like KONSTRUKTOR-MEKHANIK .
Below there are manuals/leafets which can be downloaded by clicking on the appropriate image.
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