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Inventor was a construction system where most strips had equispaced 10mm long 'eyelets' with hooked ends which can engage in the eyelets. It was made in Czechoslovakia in the early 1920s by the company which later became Merkur.

Manufacturer / Distributor

An unknown company from Czechoslovakia

Info from the Metal Constructional Systems Database for INVENTOR (Ref:INT)

System Type
Non-Meccano type
Czechoslovkia / Czech Republic
1920 to 1925
(see comment *1)
Boss Type
(see comment *2)
Boss Thread
Diametrical Pitch of Gears
No. of Parts in System
Hole Pitch (Spacing) (mm)
23.0 (see comment *3)
Diameter of holes in Strips(mm)
Diameter of the Bore in Bosses(mm)
Diameter of Axle Rods(mm)
(Screwed Rods or Bolts are used as axles.)
Types of Nuts and Bolts
Nuts: hexagonal
Material/Finish of Nuts and Bolts
Size of the Nuts across Flats (mm)
Bolt diameter (mm)

Greyish Strips & Angle Girders, most with equispaced pushed thru 10mm long 'eyelets', & most with hooked ends which can engage in the eyelets. *1 Only on some Rod ends *2& in Wheel bores. *3Scaled eyelet pitch.

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