Would it really be expensive? 1 mbar is a low grade vacuum. You can achieve that with mere rotary vane pumps: http://en.wikipedia.org/wiki/Rotary_vane_pump htt

Would it really be expensive? 1 mbar is a low grade vacuum. You can achieve that with mere rotary vane pumps: http://en.wikipedia.org/wiki/Rotary_vane_pump http://en.wikipedia.org/wiki/Rotary_vane_pump