I am not going to climb up into my attic but I can attest to the following:
The NBCUSC (National Basketball Committee of the United States and Canada:
The precursor to the NFHS and NCAA Men's Committees) had Three-Person Mechanics in its Officials Manuals from at least the mid-1960s.
MTD, Sr.
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Mark T. DeNucci, Sr.
Trumbull Co. (Warren, Ohio) Bkb. Off. Assn.
Wood Co. (Bowling Green, Ohio) Bkb. Off. Assn.
Ohio Assn. of Basketball Officials
International Assn. of Approved Bkb. Officials
Ohio High School Athletic Association
Toledo, Ohio
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