Kiddicraft was among other activities the predecessor of Lego bricks. It was founded in 1932 by Hilary Harry Fisher Page (1904–1957), who created the self-locking bricks.
In 1939 Hilary Page applied for a patent for 'Toy Building Blocks'. In this and subsequent patents he described hollow bricks with 4 and 8 studs on top. These 'Self Locking Bricks' were manufactured as a Hilary Page 'Sensible' Toy, made in England after the 1939-45 war.
Lego copied the design of the Kiddicraft brick after examining a sample given to them by the British supplier of an injection moulding machine they had purchased. Page was never aware of this, and his daughter has stated that she "was relieved that my father never knew about Lego before he died.” Lego eventually acquired the rights to Kiddicraft in 1981 prior to beginning litigation against Tyco.