| 21. | Rothstein likens these transporters to " little vacuum pumps ."
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| 22. | During the 1930s, improvements in vacuum pumps made vacuum deposition methods, like sputtering, possible.
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| 23. | Helix is a leading supplier of vacuum pumps that are needed to make semiconductors.
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| 24. | Maintaining a vacuum in the liquid ring vacuum pump is used for this purpose.
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| 25. | He demonstrated the vacuum pump to separate the pairs of copper hemispheres using air pressures.
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| 26. | Helix develops low-temperature devices and vacuum pumps for makers of electronic parts, such as semiconductors.
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| 27. | The first support meeting I went to they brought out vacuum pumps and the like,
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| 28. | In 1922, he was trying to develop an industrial vacuum pump for vacuuming iron filings.
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| 29. | That tube was evacuated by the highly effective mercury vacuum pump created by Hermann Sprengel.
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| 30. | Typically, a vacuum pump is used to remove the air from the empty heat pipe.
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