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.
1978 LEGO Sets
In 1978, LEGO released several new sets and themes, including the LEGO City theme, which expanded upon the city sets released in previous years and introduced new models of public transportation such as buses and taxis.