Can someone please inform me the difference between the engineering approval in the title block and the approvals in the rev block? I'm sure my company does it different than most but typically we place the initials of the engineer who approves a drawing from numeric rev (prototype) to rev A (production). However, we also have a rev block that lists rev A and the same info (initials, date). To me it seems redundant, and no one else at the company can really tell me what the difference is. Any insight would be greatly appreciated.