Boom and counter boom of the crane 2.13 Trolleys for the movement of the load m 1 and counterweight m2. The trolley shown in Fig. 13, consists of a chassis or metal base and four wheels which are to move into two rails. The rails that belong to the boom are longer than those of the counter boom.
Water easily passes though this EZ-Dry polyurethane foam. * Outdoor furniture such as seat and back cushions and mattresses. * Boat or marine cushions, golf carts, pool, patio or grading cushions. * Can also be used under Phifertex material and for filtering or padding whatever is exposed to large amounts of water.
Polypropylene is another term that anyone shopping for high school furniture has come across. It might sound imposing and technical, but polypropylene is just a soft plastic. The seats on school chairs are made of either hard or soft plastic. Hard plastic chairs are, as their name indicates, hard. They have no give or bend, but are incredibly strong.