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Description

F99 serves as a residual classification for mechanical engineering inventions, lighting systems, heating apparatus, weapons, and blasting technologies that do not fit within the more specific classes F01–F98 of Section F. This catch-all category accommodates novel or atypical mechanical technologies, unusual combinations of known mechanical elements, and emerging mechanical engineering concepts that lack adequate coverage elsewhere in the section. Examiners should conduct thorough searching in F01–F98 before classifying documents in F99, as it is intended only for inventions genuinely outside the scope of established mechanical engineering classifications.