Keywords: Freemantle straight-line linkage.jpg en Freemantle straight-line linkage British Patent 2741 November 17 1803 http //www gutenberg org/files/27106/27106-h/27106-h htm http //www gutenberg org/files/27106/27106-h/images/fig-14 jpg William Freemantle before 1803 Mechanical linkages Files from Project Gutenberg Scott Russell linkage PD-old |