| 21. | In 1942, David J . Kelman patented a toroidal metal scouring pad.
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| 22. | For this, also toroidal winding machines with special magazines can be used.
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| 23. | The electronics provide two constant current sources to generate the toroidal magnetic fields.
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| 24. | As a consequence, toroidal transformers rated more than a few kVA are uncommon.
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| 25. | Toroidal roller bearings were introduced in 1995 by SKF as " CARB bearings ".
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| 26. | They have solved numerous problems which exhibit circular cylindrical symmetry employing the toroidal functions.
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| 27. | Thus a toroidal inductor / transformer, radiates less electromagnetic interference ( EMI ).
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| 28. | With Tihiro Ohkawa he invented toroidal devices for containing the plasma with magnetic fields.
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| 29. | This corresponds to a negative toroidal energy density symmetric to the x-axis.
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| 30. | It was housed in the service module and had two toroidal tanks for pressurization.
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