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In the late 1950s, a 10-year retrospective study of fatal tractor accidents was conducted by Walter McClure and Ben Lamp, both of the Department of Agricultural Engineering at The Ohio State University, to understand their nature and causes.

San diegoUnited statesOhio state universityKennetha harknessKen harknessCarlton zinkWalter mcclureAmerican nation standards instituteAmerican national standards instituteTire companyHealth actCanadian standards associationAutomotive safety foundationHome safety committeeUniversity of iowa invitational safety seminarNational safety council