Acronyms, Abbreviations, and Initialisms.
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The meaning of the Acronym GM4 is...

GM4 is

  • Autologic mode 4 gray-scale files Bitmap graphics

GM4 is also in:

Acronym Definition Searched: GSOI UN VDSL OCB UER GT 16915 KGB PCI WSSI RBW WCVX MRC SOAR GMCS