Educational toy made in plastic versions. In the mid-1950s, more explicitly engineering-themed construction toys appeared, including plastic girders, columns, and panels that could be assembled into a model curtain wall skyscraper. Later, this Girder and Panel structural system was extended to a Hydro-Dynamic setup by adding pipes, valves, tanks, nozzles, and pumps to allow construction of model plumbing, HVAC, and chemical engineering systems like a simulated distillation column. Other extensions of the system supported suburban-style housing developments (Build-A-Home), or monorail transportation systems (Skyrail). The building toy Lego was originally developed by Ole Kirk Christiansen in Billund, Denmark, in the 1930s. The name
The Lego Group seized by Finland customs authorities. The packaging of the Enlighten products was similar to official Lego packaging. Their Chinese manufacturer failed to appear in court, and thus Lego won a default action ordering the destruction of the shipment. Lego Group footed the bill for the disposal of the 54,000 sets, citing a desire to avoid brand confusion and protect consumers from potentially inferior products. In 2004, Best-Lock Construction Toys defeated a patent challenge from Lego in the Oberlandesgericht, Hamburg. The Lego Group has attempted to trademark the "Lego Indicia", the studded appearance of the Lego brick, hoping to stop production