MARETTOTO Siezen CL, Bont L, Hodemaekers HM, Ermers MJ, Doornbos G, Van't Slot R, Wijmenga C, Houwelingen HC, Kimpen JL, Kimman TG, Hoebee B, Janssen R (April 2009). "Genetic susceptibility to respiratory syncytial virus bronchiolitis in preterm children is associated with airway remodeling genes and innate immune genes". It was a feature of the highly successful Aurora HO slot cars of the 1960s and 1970s. The motor was not a separate unit; instead, its individual elements - magnets, armature, commutator and brushes - fit into recesses in the blocky chassis. Cheaper ones lack any form of a suspension and the ones that do feature a suspension that has very primitive or rudimentary designs.|Power Dividers and Directional Couplers