Neville's public teaching career from February 1938 to February 1972
Date (happened)
between February 1938 and February 1972
unresolved
between February 1938 and February 1972
stated · preferred
Reasoning
Neville states both endpoints of his teaching career directly and by name -- the start month/year and the current month/year -- so this is read straight off the source with no derivation, hence type stated and no inheritance ceiling applies. The end month is independently corroborated at certain confidence by the lecture's own chrome-dateline delivery claim (d2, 'February 1972').