| 31. | This problem can be solved by purging the vacuum system with dry pure nitrogen before pump down.
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| 32. | Many cyclonic vacuum systems now feature translucent dirt collection canisters, allowing quick inspection without removing the canister.
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| 33. | A vacuum system lifts coins and other artifacts into a container to be hoisted to the surface.
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| 34. | Typically, elaborate hydraulic or vacuum systems have been employed to compress holographic film during the exposure process.
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| 35. | New portable track vacuum systems are in the works as the MTA is working with two manufacturers.
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| 36. | Allergists also played an important role in the growing popularity of central vacuum systems in the 1990s.
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| 37. | It was heralded as being an innovative new hospital, with a central vacuum system and piped oxygen throughout.
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| 38. | Two systems were prototyped and tested; a screw conveyor system and a novel cyclonic separator and vacuum system.
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| 39. | In ultra high vacuum systems, some very " odd " leakage paths and outgassing sources must be considered.
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| 40. | The control system used a pneumatic / vacuum system, an electric system and an aneroid barometer / altimeter.
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