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Took me a minute to realize that by "G machine" you meant the graph reduction abstract machine. As in "spineless, tagless G machine."
See, Symbolics had a machine called the G machine, which was the L machine but redone in gate arrays (3610 & 3620, if memory serves). Just as fast or a bit faster, cheaper to make... and the marketing geniuses priced it *higher*.
Both called G machines, both novel architectures based on gate arrays, and both quite distinct things!