| 摘要 |
PROBLEM TO BE SOLVED: To supply positive pressure and negative pressure with one power source without separately using a compressor or a vacuum pump. SOLUTION: The positive pressure/negative pressure supply device has a single pump having an outlet and an inlet, a changeover mechanism is connected to the outlet and inlet, and the positive pressure or negative pressure is supplied through a positive pressure passage and a negative pressure passage. COPYRIGHT: (C)2004,JPO
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