1951 �?Charles Tough Townes conceives the maser (microwave amplification by stimulated emission of radiation), the predecessor with the laser (gentle amplification by stimulated emission of radiation). In 1954, he demonstrates the maser operates with a device that emits a wavelength of ≈one cm. Creation is Expense-productive and economically possible whatever https://www.seo-bookmarks.win/how-to-solve-issues-with-china-laser-marking-machine