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The train was designed with the parts pre-scored and tabbed for assembly without cutting or adhesive but the tabs were prone to coming apart, and the train did not stay on the cardstock track reliably once assembled. As a result, the paper train overwhelmed many customers, so often parents simply gave up on assembly and threw it out.
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Paper car wheels were invented by the locomotive engineer Richard N. Allen (1827–1890), [4] who set up a company with his brother-in-law in 1867, producing paper from straw. They dampened vibrations much better than conventional cast-iron railway wheels, which transmitted all imperfections of the track into the car above it, making train ...
Let F k be a free group of finite rank k ≥ 2. Fix a free basis A of F k and an identification of F k with the fundamental group of the rose R k which is a wedge of k circles corresponding to the basis elements of A. Let φ ∈ Out(F k) be an outer automorphism of F k. A topological representative of φ is a triple (τ, Γ, f) where:
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