1957
stated · doubtful · preferred
Source
Neville lectures catalog #73
Reasoning
|| v1.1/l7/propagate-node-refutation: lowered `certain` -> `doubtful` under A-121. THE CONTRADICTION: node 1035, the lecture this claim was copied to, holds the identical date 1957-??-?? as REFUTED, and records why — "Copied without semantic change from linked historical event 45. || v1.1/l7/apply/c1: refuted by L7 adjudication (#2363), shape `catalogue_block_error`. The delivery date that stands on this lecture is 1969-01-31. Full evidence in npr 73795.". A delivery date refuted on the lecture cannot stand as `certain` on the lecture event it was copied from. ⛔ Lowered only, never refuted: A-121's floor is `doubtful`, and nothing here is deleted — the date, its type, its source note and the prior confidence (certain) all survive, so this reverses from the ledger.