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- ...by numerous individuals, the most prominent of which were R. van Tijen of Demotech, J. Haemhouts <ref>Sandiford, Peter, et al. [http://www.washdoc.info/docsea30 KB (4,758 words) - 23:38, 31 December 2019
- In the 70s, R. Van Tijen of the Dutch Demotech organisation reintroduced the pump, and started using modern materials such5 KB (843 words) - 01:18, 19 May 2015