Allen S. Kline
Kline, Allen Sides
December 19, 1893 – February 19, 1971 (aged 77)
Birth place: Rock Falls, Whiteside, Illinois, USA
Though mentioned in 'Science-fiction: The Gernsback Years' as being the son of Otis Adelbert Kline, there is no evidence that Otis was ever even married. He did have a brother though, Allen Sides Kline (1893-1971).