History
The earliest liquid ring pumps date from 1903 when a patent was granted in Germany to Siemens-Schukert. US Patent 1,091,529, for liquid ring vacuum pumps and compressors, was granted to Lewis H. Nash in 1914. They were manufactured by the Nash Engineering Company in Norwalk, CT. Around the same time, in Austria, Patent 69274 was granted to Siemens-Schuckertwerke for a similar liquid ring vacuum pump.
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