'Other' Constructional and Allied Systems Info & Downloads
Konstruktor(15) was a metric system similar to Eitech Construction. It has a few unique parts. It was made in Russia by OJSC Michurinsky Plant "Progress" (ОАО Мичуринский завод «Прогресс») from at least 1981 to at least the early 1990s.
Info from the Metal Constructional Systems Database for KONSTRUKTOR 
Hole pitch <12.7mm
known in early 1980s (some significant doubt)
(see comment *1)
Bolts: round (slotted)
Small set including 5 holes diameter Disc with rectangular hole pattern. Lid has a dumpy 'boy' waving a Spanner. *1 Axles with screwed ends.
Below there are manuals/leafets which can be downloaded by clicking on the appropriate image.
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