Hydraulic leveling and controlling device
作者： Christopher N Adams
DOI:
关键词: Computer science
摘要:
lens.org 参考文章(4)
Christopher N Adams, Self-leveling scraper blade ,(1940)
William T Stephens, Apparatus for controlling fluid pressure ,(1941)
Frank Manley, Grade-controlled auxiliary air-valve for internal-combustion engines. ,(1917)
Herbert O Day, Hydraulic control apparatus ,(1939)