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| Patents for Dynamic Specialties | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,678,792 | Jul. 25, 1972 | F. Dvorak | Metal plate shears | metal shearing machines | |
| 3,899,950 | Aug. 19, 1975 | J. Dvorak | Bar shear | metal shearing machines | |
| 3,945,287 | Mar. 23, 1976 | J. Dvorak | Sheet shear | metal shearing machines | |
| 4,054,075 | Oct. 18, 1977 | J. Dvorak | Shear mechanism | metal shearing machines | |