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| All Patents in class 361/149 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,548,563 | Aug. 04, 1925 | H.K. Spencer | Means For Handling Articles | grinding attachments | |
| 1,628,618 | May 10, 1927 | H.K. Spencer | Means For Handling Articles | grinding attachments | |
| 4,402,032 | Aug. 30, 1983 | B.W. Wilterdink | Electromagnet Power Supply and Demagnetizer | magnetic chucks | |
| 4,771,358 | Sep. 13, 1988 | A.R. Millner | Magnetic chuck controller | magnetic chucks | |