PTB was not needed at LOS because the body side and the chassis side of the plant were already merged into the General Motors Assembly Division (GMAD) operating model meaning GMAD operated as one company.
At Norwood the assembly operating model still relied on separate GM divisions to assemble cars. At Norwood Fisher body and Chevrolet were locked in a subcontractor/prime contractor relationship.
At times the relationship between Fisher and Chevrolet was openly Hostile and crossing between the two sides by personnel from either side was a negotiated business agreement.
PTB Stamps were part of the Fisher Body audit process to combat claims of damage to the coach after receipt by the chassis side at Chevrolet.
Damage claims by Chevrolet were cost reimbursable through GM and hurt Fisher Body's Profit margins.
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