Ole Kirk Christiansen, a carpenter from Billund in Denmark established his company in 1932 with the aim to encourage imaginative play and imagination in children. He began by manufacturing stepladders. However the Great Depression forced him into a more flexible business model. He turned his attention to manufacturing toys, and he established one of the most adored brands in the history of the world.

Christiansen was a naive man who was quick to adopt new materials and techniques. In 1947, he was the first company to acquire an injection molding machine made of plastic in the world. This significantly boosted the capabilities and range of Lego products. The machine also allowed him to explore a design which would eventually become the iconic Lego brick. The bricks were hollow on the bottom and had pegs at the top. They interlocked to allow children to build intricate structures that were far more complex than those created using wooden blocks from earlier generations.

The 1950s were a decade that saw the business expand. Kjeld Kirk Christiansen, Godtfred Kirk Christiansen’s daughter, joined the management team and began modernizing company’s manufacturing methods. The expansion included the launch a line dollhouses, furnishings and individual figures called Minifigures. In 1979 the company expanded into space with sets presenting astronaut minifigures as well as rockets, lunar rovers, spaceships and more in addition to medieval areas with a Castle theme.

In 1990, the company introduced three Model Team Sets that were made for builders who were advanced. These sets introduced small parts such as axles, gears and levers, and offered the kind of realistic accuracy that was unheard of in the Lego series at the time.

https://lego-x.com/2020/02/22/a-brief-history-of-the-creation-of-the-lego-constructor/