'Other' Constructional 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.
Manufacturer / Distributor
Moscow toy factory "Eaglet", Russia (московский завод игрушек "Орленок")
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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