Tracked vehicles for ascending or descending stairs, (magnetic or pneumatic ground-engaging parts B62D55/265; chairs or multi-track cycles specially adapted for invalids A61G5/00)

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Endless track vehicles (steering aspects B62D11/00; ) > with tracks without ground wheels > Tracked vehicles for ascending or descending stairs, (magnetic or pneumatic ground-engaging parts B62D55/265; chairs or multi-track cycles specially adapted for invalids A61G5/00)