I'm coming to the conclusion that Dobro indicated that the instrument is played horizontally while Resonator is played vertically. And Dobro seems to indicate quite often a square neck, although not always.
The confusion seems to be that Dobro is a brand name of a guitar which can be square neck or round, played lap style flat or upright.
But a 'Dobro player' seems to indicate someone who plays square neck, lap style flat, a la Jerry Douglas. A 'slide player' is thought of as always playing round necks upright.
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