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Early pneumatic tyre, use is made of coated with rubber canvas when tire body, because the canvas ordinate and horizontal lines cross each other, due to the deformation of the tire when walking, lead to rub against each other, in this way, the line is easy to be ground breaking, the tires can only run 200-300 km. In 1903, Mr. J. f. palmer invented the twill textile, which led to the development of cross - layer tires, making the tyre life a big step forward. Because the tire of the skew fork will no longer cause friction because of the tread of the tyre, the cord will not be easily worn out, so the life span will be considerably longer. In 1930, Michelin made the first tyre without a tyre. The world famous meridian tire was invented in 1946. Therefore, the development of the tire has been a long journey, in this long night, I do not know how many generations have paid hard labor and excellent wisdom
The locomotive signal, the train running monitoring recording device, the breakdown of the rear-end device;
The train exits the isolation mode, and manually converts it into a column control vehicle.
In the '80s and' 90s, the district hospital had no beeper and had to let family members run errands. "Nurse, there's no potion in the six, seven or eight beds in our room. Please go and change them quickly." A patient's family came to the nurse's office to yell.
From April 10 to 14, 2014, the fourth guiyang international automobile exhibition will be staged at the exhibition center of guiyang international conference. The auto show by the guiyang city people's government, Chinese automobile circulation association, China automobile industry international cooperation co., LTD., is exhibition co., LTD. Jointly organized, guizhou daily newspaper group seec, guiyang is exhibition service co., LTD., guiyang RGL convention and exhibition co., LTD., guizhou landscape charm advertising companies to undertake together, the guizhou metropolis daily for media, guiyang is as an executive organizer, conference and exhibition service co., LTD
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