LEGO Supplementaries were sets released during the early days of the LEGO system. These sets were designed to supplement and expand upon the building possibilities of existing LEGO sets. Instead of being complete stand-alone models or kits, Supplementaries provided additional bricks, special parts, wheels, windows, doors, gears, or even motors. These sets were especially useful during an era when LEGO's product line was simpler and less specialized than it is today.
1974 LEGO Sets
In 1974, LEGO released several new sets and themes, including the LEGO Universal Building Set, which included a range of new bricks in different shapes and colors. 1974 was also the year that LEGO introduced the LEGO Technic theme, which focused on building complex, mechanically-themed models such as cars, airplanes, and construction equipment. The Technic theme introduced new elements such as gears, levers, and motors, which allowed for more realistic, functional models. Other notable sets and themes released by LEGO in 1974 included the LEGO Space theme, which expanded upon the Space sets released in previous years, and the LEGO Trains theme, which introduced the first LEGO electric trains.