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Invented by Guglielmo Marconi, this was the first time someone could wirelessly connect to someone across the Atlantic Ocean, starting the way for wireless connections everywhere.
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Jagadis Chandra Bose filed a patent for Diodes, semiconductors that can detect radio waves. This is important, because semiconductors are used in very many inventions that came afterwards.
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Invented by Willem Einthoven. This is important because it was able to detect very small amounts of electricity.
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Leo Baekeland invented the first fully synthetic plastic. As today we use plastic in everything, from water bottles to artificial hearts to computers, this invention is quite important.
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Luther Haws invented the modern water cooler and filter. The filtering aspect is extra important, because in manufacturing, filtering cooling agents is extremely important, and these materials are used to make computers among other things.