Linde was enough of an entrepreneur to recognize his process could be applied to other industries such as slaughterhouses and other food industries. His fortunes greatly increased when he improved his machines to continue cooling until the air itself liquefied. Linde could readily supply pure gases at great volumes for a low price. Liquid carbon dioxide, nitrogen and oxygen are used for many purposes in today's society so he exchanged his patents for stocks and holdings in liquid gas companies in other countries to further expand his wealth. He continued research into different gases to improve efficiency of his units well into his sixties when he handed control of his business to his sons.
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