1 | http://www.parallemic.org |
2 | J. E. Gwinnett, 'Amusement devices,' US Patent No. 1,789,680,January 20, 1931 |
3 | D. Stewart, ' A plarform with six degree of freedom,' Proc. of the Institute of Mechanical Engineers(Part 1), vol. 180, no. 15, pp.371-386, 1965-1966 DOI |
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