1
Lorne G Gabel, Garry E Paulson, Thomas G Kirk: Highway premarking guidance system. Her Majesty the Queen in right of Canada represented by the Minister of Highways and Transportation, January 27, 1981: US04247870 (220 worldwide citation)

A method and apparatus for marking a line, such as the centerline, along a roadway, using a vehicle carrying paint marking apparatus, in which a pair of television cameras, one mounted on each side of the vehicle, view the edges of the roadway and project the images onto a split screen. By keeping t ...


2
Ronald F Woollam: Road/rail power unit. Her Majesty the Queen in right of Canada represented by the Minister of Highways and Transportation, Biebel French & Nauman, May 21, 1991: US05016544 (19 worldwide citation)

This invention relates to a convertible road/rail power vehicle including a tractor unit provided with retractable wheel sets and rail equipment that enable it to be operated on either highways or railway tracks and when on rail to pull a multiplicity of loaded or unloaded railway cars.