[1] After the 1963 merger with the DSM Hendrik the deepest shaft was 1,058 metres (3,471 ft) deep.

DSM director and engineer Frederik van Iterson made a new design of a concrete hyperboloid natural draught cooling tower, which evolved into the standard design that is used at modern power plants.

The design was patented by Van Iterson and Gerard Kuypers in the Netherlands on August 16, 1916.

[2] The first Van Iterson cooling tower was built and put to use on the DSM Emma terrain in 1918.

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