Electric heater for stock watering tanks
作者： Jacob T Landgraf
DOI:
关键词: Business 、 Finance 、 Financial economics 、 Stock (geology)
摘要:
lens.org 参考文章(5)
George E Henderson, Stock watering tank heater ,(1936)
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Ehrgott Karl, Electric cooking appliance ,(1933)
Tiodolf Lidberg, Electric heating appliance. ,(1916)
Floyd A Blashfleld, Electrically heated apparatus ,(1929)