What are the different transmission mediums?

Below is a list of Tesla patents. Nikola Tesla was an inventor who, it is said, accumulated 1,200-plus patents worldwide for his inventions. Some of Tesla's patents are not accounted for, and various sources have discovered some that have lain hidden in patent archives. There are a minimum of 272 patents issued to Tesla in 25 countries that have been accounted for. Many of Tesla's patents were in the United States, Britain, and Canada, but many other patents were approved in countries around the globe. Many inventions developed by Tesla were not put into patent protection (Cheney, 62).