You have a typo in your text. The Arabic term is مسحاج
It is also called مكشطة

A scraper is defined as "a self-propelled machine capable of digging, loading, hauling, dumping, and spreading materials; used to move earth by stripping or collecting a layer with a cutting blade while moving forward, pushing the earth into a bowl, and then unloading it."

McGraw-Hill Dictionary of Architecture and Construction

http://www.answers.com/main/ntquery?s=scraper