'Other' Constructional and Allied Systems Info & Downloads
Mex(1) Construction Sets
Mex(1) was an unusual construction system. The strips etc had slots to the edge on them in addition to holes. This UK system was made in Bavaria in the early to mid 1930s.
Info from the Metal Constructional Systems Database for MEX 
Hole pitch >12.7mm
1933 to known in 1935
--- (Screwed Rods or Bolts are used as axles.)
Bolts: tapered cheese (slotted)
Steel with a Brass finish
Lid has boy with Tower Bridge. Made in Bavaria on No.1 packet. Ni Strips & Wheel Disc with ¼" long slots to edge between holes, & ½" lengthwise slot over some holes. Disc pitch 9.5. Parts joined by N&B or engaging slots.
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 manuals/leafets which can be downloaded by clicking on the appropriate image.
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