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Triple Rotacaster commercial industrial omni wheel A simple omni wheel. The free rotating rollers (dark gray) allow the wheel to slide laterally A molded plastic omni wheel Omni wheels or poly wheels , similar to Mecanum wheels , are wheels with small discs (called rollers) around the circumference which are perpendicular to the turning direction.
The Wickham trolley was a railway engineering personnel carrier built by D. Wickham & Co of Ware, Hertfordshire. This long established firm introduced their rail trolley in 1922 as a lightweight track inspection and maintenance vehicle. This was a success and production of rail trolleys and railcars for inspection and maintenance continued ...
Drawing up a comprehensive list of words in English is important as a reference when learning a language as it will show the equivalent words you need to learn in the other language to achieve fluency.