Johannes "Hanns" Evangelist Hörbiger (29 November 1860, in Atzgersdorf – 11 October 1931, in Mauer) was an Austrian engineer from Vienna with roots in Tyrol. He took part in the construction of the Budapest subway and in 1894 invented a new type of valve essential for compressors still in widespread use today. He is also remembered today for his pseudoscientific Welteislehre ("World Ice doctrine").
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