russell earl marker معنى"russell earl marker" أمثلة على "russell" معنى "earl" معنى "marker" معنى "john russell, 1st earl russell" معنى "francis russell, 2nd earl of bedford" معنى "marker" معنى "boundary marker" معنى "cardiac marker" معنى "change marker" معنى "chris marker" معنى "fiducial marker" معنى "gap marker" معنى "genetic marker" معنى "hazard marker" معنى "intermediate marker" معنى "lane marker" معنى "marker (linguistics)" معنى "marker pen" معنى "mdl marker" معنى "microsatellite marker" معنى "mine marker" معنى "minefield marker" معنى "paintball marker" معنى "reflective marker" معنى "reflectorized marker" معنى أمثلة Russell Earl Marker (March 12, 1902 – March 3, 1995) was an American chemist who invented the octane rating system when he was working at the Ethyl Corporation.
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