RMP.1:5.3 - Historical Source-Critical Contrast

A local archive group asks whether a change in maintenance practice followed one directive or emerged earlier across workshop records. The question can be research without an experiment and without academic affiliation when the current frame is incomplete, rival chronologies matter, source provenance and silences need non-routine criticism, the trace is inspectable, and the result is a bounded historical claim. If one current authenticated record already answers the narrow date question, return that source result instead. Access, rights, conservation, and institutional interpretation authority remain external.