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Miniature valves

Its interesting to read and to understand new things that I haven't heard about before. And there are so many types of jobs that exist and its interesting to read about it and try and figure it out to see if I get it. For example I was reading a bit about miniature valves and its quit interesting to see what you can use them for and that they exist I didn't know about it. 
There are so many small valves and things that are really important for big things ans machines and so on. Its so much to read about ...