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I doubt this can be exactly determined. Some early computers using CRT DRAM for memory had an extra tube that could be switched to any bank to display memory contents as dots for 1's, this might be considers a monochrome monitor though it was of limited use. Many early computers that needed a display used RADAR tubes. On microcomputers in the 1970s an ordinary TV was used. There were probably many inventors, of many different forms.

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