Before LEGO came with the "LEGO Technics" (of which many parts are used in LEGO Mindstorms) they experimented with different gear systems. Displayed is the one I used in Europe (I understood that a different version was released in the USA). The gears can be combined at a 90 degree angle as well. The gears have 21, 15 and 9 pins, allowing gear ratios of 7:5, 7:3 and 5:3.
Even though the axles are white, they are still compatible with Technics. Similarly the bricks, wheels and stop bush are all still usable, although they have different colours. Not all the stop bush have the same shape: some are intended to be stops, others are intended to be used with rubber bands. The metal pins are used to connect the system to the 4.5V and 12V motors that existed at the time. The threads allow attachment of regular LEGO parts, unfortunately most of the pieces of the thread got lost.
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I still some of those gears and the grey bricks with holes. AFAIK they were part of a set to build an excavator of some sorts. My memory is fuzzy about this excavator. I also have the tires that can be fitted onto the small red gears.
Possibilities were limited with this pre-Technic Lego.
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