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El Ingeniero Infantil Construction Sets

El Ingeniero Infantil was a Trix-like system. It was made in Argentina from 1933 to about 1940.

Manufacturer / Distributor

Unknown company, Buenos Aires, Argentina

Info from the Metal Constructional Systems Database for EL INGENIERO INFANTIL (Ref:EII)

System Type
as TRIX (inc MCX)
1933 to circa 1940
Steel (see comment *1)
Boss Type
Boss Thread
Diametrical Pitch of Gears
No. of Parts in System
16 (see comment *2)
Hole Pitch (Spacing) (mm)
7.8 (see comment *3)
Diameter of holes in Strips(mm)
3.5 (see comment *4)
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)

Looks like TRIX. One model, a Crane, is as MEKKANO. *1 Soft tinplate. *2 Set 1, there may be a Set 2. *3*4 12.7 & 4.2 in MCS.

The MCS document for this system is shown below. It can also be downloaded to your computer if desired here

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The report can be zoomed into, made full screen or downloaded as a pdf document by using the controls provided

Below there are various manuals/leafets which can be downloaded by clicking on the appropriate image.

The box lid of an El Ingeniero Infantil set 1
Added 09/09/2022