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| All Patents in class 554/56 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,874,174 | Feb. 17, 1959 | P.F. Thompson, C.F. Huber | Bituminous Bonding Compounds | manufacturing processes | |
| 2,875,219 | Feb. 24, 1959 | P.F. Thompson, C.F. Huber | Bituminous Bonding Agents | manufacturing processes | |