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FASA also published numerous sourcebooks, known as Technical Readouts, which featured specifications for new combat units that players could select from. The game's popularity spawned several variants and expansions to the core system, including CityTech which fleshed out urban operations, infantry, and vehicle combat, AeroTech which focused on air and space-based operations, and BattleSpace which detailed large spacecraft combat. Catalyst Game Labs has continued this practice.
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When Fantasy Productions licensed the property, these "Unseen" images were expanded to include all art produced "out-of-house" – that is, whose copyrights resided with the creators, not the company. This led them to be termed by fans as "the Unseen". The anime-sourced BattleMechs continued to be referenced in-universe, but their images were no longer seen in new sourcebooks. Following the suit, FASA made the decision to use only images that they owned in future products. FASA realized that the use of licensed images made them vulnerable to lawsuits and worried that such a suit would bankrupt the company. Although Playmates was ordered to stop using the images in question, FASA received no financial compensation. Bills explained that FASA had sued Playmates over the use of images owned by FASA. In 2007, Classic BattleTech line developer Randall N. In later years, FASA abandoned these images as a result of a lawsuit brought against them by Playmates Toys and Harmony Gold over the use of said images. The rights to these images were licensed from Twentieth Century Imports (TCI). Rather than create their own original robot art, FASA decided to use already-extant designs that had originally been created for a variety of different Japanese anime, including Dougram, Crusher Joe, and Macross.
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