| http://www.w3.org/ns/prov#value | - As used herein, ???substantially perpendicular??? will mean that two objects or axis are exactly or almost perpendicular, i.e. at least within five degrees or ten degrees of perpendicular, or more preferably within less than one degree of perpendicular.Gimbal mechanism 240 is formed as a five member closed chain or loop, such that a first member of the chain is coupled to the last member in the ch
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