 Date: 2013-07-25 14:50:00Mechanical engineering Presta valve Bicycle pump Mason jar Vacuum Valve Pressure cooking Check valve Valve stem Valves Technology Fluid mechanics | |  Hand Operated Vacuum Packing System for Seed Storage Allen Dong and Roger J. Edberg, I-Tech, P O Box 413 Veneta, Oregon 97487, USA This invention was declared public domain on November 29, 1989, a gift to humanity. A han
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