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Willard Q. Haak
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Peoria, IL, US
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last 30 patents
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Patent Grant
Dual radial piston pump or motor
Patent number
4,064,790
Issue date
Dec 27, 1977
Caterpillar Tractor Co.
Willard Q. Haak
F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES