| 1. | Later, magnetron tubes were used as components in microwave ovens.
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| 2. | By 1920 his research led to his invention of the magnetron.
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| 3. | Magnetrons are manufactured in large volumes for use in microwave ovens.
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| 4. | Historically, the problem with magnetrons has been their short life.
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| 5. | Ceravision has an agreement with Toshiba to develop high efficiency magnetrons.
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| 6. | Okabe continued to devote much of his research to improving magnetrons.
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| 7. | At the LEMO, magnetrons were a major item of research.
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| 8. | The problem with existing magnetrons was not power, but efficiency.
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| 9. | The magnetron was invented by H . Gerdien in 1910.
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| 10. | In this form, approximately one billion magnetrons are in use today.
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