Stairwell vacuum hose

作者: Jacquelyn Smith

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参考文章(9)
James C Hamrick, Vacuum pickup apparatus ,(1969)
Norman J. Schneider, Vacuum cleaner adapter for micro tools ,(1989)
Joseph W Reiling, Built-in central vacuuming device ,(1969)
Bruce Edmund Stewart, John Bartholomew Lyman, Vacuum cleaner hose end structure ,(1975)
Ralph E. Patterson, Hose for a wet and dry vacuum cleaner ,(1994)