'Other' Constructional and Allied Systems Info & Downloads
HMT (Heavy Mechanical Truck) Construction Set
The HMT (Heavy Mechanical Truck) Construction Set has parts to similar to Eitech Construction and is classified as a Polylong(1) type set. Only the one set has so far been seen despite a search of the internet. The only address is of an Australian distributor, although it was almost certainly made in China.
Info from the Metal Constructional Systems Database for POLYLONG 
2003 to in production in 2018 and continuing
25 (see comment *1)
4.2 (see comment *2)
Bolts: pan (crosshead)
Steel with a Bright Zinc plated finish
6.5(see comment *3)
Various Sets (see separate list) from Polylong & other makers. Most parts as CONSTRUCTION  but some others. *1 Mod.1 & finer for Motor/Gear Unit.. *2 Square holes in some RCEE sets, see TRONICO [a]. *3 6.1 & 7.4 also reported.
Below there are manuals/leaflets which can be downloaded by clicking on the appropriate image.
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