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The only way I see
I see only two ways to generate vacuum legally:
1. Use a cylinder to create a vacuum in the air tube and suction cup by driving the cylinder with another actuator (motor, etc.).
2. Use the suction cup itself. If you would use a bellows-style cup, you can press it down, seal it, and then pull up on the cup a bit and there would be a vacuum in the cup.
Neither of these uses would not give you very good vacuum, but vacuum none the less.
Andy B.
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