午夜福利片手机在线播放片源豐富_福利日韩第一导航_老司机在线免费视频_日本黄色视频免费网_亚洲av伊人影视_在线观看欧美亚洲三级_精品无码专区久久_亚洲一级av无码毛片新_六月天丁香婷婷_日韩丝袜老师无码AV

Tianjin Yishan construction machinery Co., Ltd（Formerly Tianjin Construction Machinery Factory） was established in 1953. Since the first crawler type bulldozer was developed in 1958, we have a history of manufacturing crawler type bulldozer for more than 60 years.

We participated in the formulation of national standards，such as “Technical Conditions of Crawler Type Wetland Bulldozer”, “Test Methods for Crawler Type Bulldozer” and “Technical Conditions for Crawler Type Bulldozer”.

The intelligent tool robot developed by the company in 2015 won the China Original Technology Award of the 15th China Economic Forum sponsored by People's Daily.