| 41. | The rotary washing machine was patented by Hamilton Smith in 1858.
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| 42. | The Blake crusher was patented by Eli Whitney Blake in 1858.
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| 43. | Erich Franke invented and patented the wire race bearing in 1934.
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| 44. | He patented an improved geared truck for his engines in 1901.
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| 45. | In 1901 Luigi Bezzera of Milan patented improvements to the machine.
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| 46. | In 1919, Abushady patented a removable, standardized aluminum honeycomb.
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| 47. | In this assignment he patented a number of mechanisms and components.
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| 48. | In addition, early equipment was often patented by its manufacturer.
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| 49. | James Sumner of Lancashire patented the first Leyland Steam Motor Company.
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| 50. | Theodore Steinway of Steinway & Sons patented tunable aliquots in 1872.
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