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These prototypes are presented to the entire project team for comment and for testing by parents and children during the "validation" process.
Designs may then be altered in accordance with the results from the focus groups.
Lego pieces can be assembled and connected in many ways, to construct objects; vehicles, buildings, and working robots.
Anything constructed can then be taken apart again, and the pieces used to make other objects.
In 1949 Lego began producing, among other new products, an early version of the now familiar interlocking bricks, calling them "Automatic Binding Bricks".
These bricks were based in part on the Kiddicraft Self-Locking Bricks, which were patented in the United Kingdom in 1939 By 1951 plastic toys accounted for half of the Lego Company's output, even though the Danish trade magazine Legetøjs-Tidende ("Toy-Times"), visiting the Lego factory in Billund in the early 1950s, felt that plastic would never be able to replace traditional wooden toys.
If the plastic cannot be re-used in Lego bricks, it is processed and sold on to industries that can make use of it.
It is then injected into the moulds at pressures between 25 and 150 tonnes, and takes approximately 15 seconds to cool.
The moulds are permitted a tolerance of up to two micrometres, to ensure the bricks remain connected.
It was his conversation with an overseas buyer that led to the idea of a toy system.
Godtfred saw the immense potential in Lego bricks to become a system for creative play, but the bricks still had some problems from a technical standpoint: their locking ability was limited and they were not versatile.
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Each Lego piece must be manufactured to an exacting degree of precision.