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The development of the wheels are done, and you need a brick, in witch you can move the wheels.
The reinvention of the wheels is made in the year 1962, so the material of the bricks is still Celluloseacetat.
The first wheel-axle-holder are lighter than the following bricks and the form of the brick is not so stable.
The inner rollers are transparency, which you canīt see under the red plate.
Since 1963 the bricks were made from ABS.
The inner rollers are black.
Since 1966 you can see the first transparency groundplate with transparency rollers.
Until 1971 the rollers are also red or black.
1971 was the year the brick changes from white into black.
First with black rollers.
Following parts have red rollers until the nineties.
The types of wheel-axle-holder are not all. So it existed mixed typeswith two black rollers and a transparency roller.
Also you see a milky groundplate and red rollers.
Special types of wheel-axle-holder exist too.
For the railway from 1966 until 1969 you get a double-holder.
For the steering-cars since 1967 you get a axle-holder with a stick, first in white and until 1971 in black.
The best construction appears in 1972.
It has a steering wheel and a part with teeths witch steers the brick in the front.
This part is only offered in three sets:
378 - tractor and trailer; 1972 until 1974
385 - jeep and trailer; 1976 until 1977
814 - tractor with farm machinery; 1975