Date (happened)
between 1930 and 1939
(possible)
passage 549287 (lecture nid 1929, 'Strong Imagination'), 'a certain invention that came out in the 30s, but was never commercialized'
Told / reported
between 22 November 1971 and 6 December 1971
(probable)
delivery claim d2 on lecture nid 1929 (state=confirmed)