Tractors were often converted into semi-tracked, especially the 'Rotaped', invented in 1941 by O. Singer from London, which was originally built by George Monroe Limited, Waltham Cross, Hertfordshire. The first public demonstration of Rotaped took place in April 1942 near Harlow, Essex. G. Monroe claimed that the traction increased by 100% while decreasing the ground pressure to 0.5 kgf/cm2. But Singer went in 1946 to embark on rubber tracks. From 1950, Leeford Limited, London, take back the factory and introduced a system of rigid rail to keep fit of the track but they returned to the traditional chain to maintain the whole. Manufacturing continued until 1967. Original links: https://www.youtube.com/redirect.php?w=tR059ltIZW4 https://www.youtube.com/redirect.php?w=Xac2JBu6Yl4 https://www.youtube.com/redirect.php?w=UVThZzr_A68 https://www.youtube.com/redirect.php?w=_CN_LU0DHw8 https://www.youtube.com/redirect.php?w=csBb9sVBaOI https://www.youtube.com/redirect.php?w=d6u4ptksD1s&list=PLSbzX4vt8dqwgPfQ0lPo1o-oHFYhzcByd In case of copyright issues, please contact us immediately for further credits or clip delete, write under the video in the comments. DISCLAIMER: Under Section 107 of the Copyright Act 1976, allowance is made for "fair use" for purposes such as criticism, comment, news reporting, teaching, scholarship, and research. Fair use is a use permitted by copyright statute that might otherwise be infringing." The materials are used for illustrative and exemplification reasons, also quoting in order to recombine elements to make a new work.