Burdett 70, 75 and 77 "Rapidgrind" Surface Grinders Mk.1 (identifiable by flat side faces to the grinding wheel cover, sloping sides to the stand, a small trapezoidal-shaped door beneath the central control wheel and the three main control wheels in a diagonal line across the face of the machine).

Burdett Elliott 70, 75, 77 "Rapidgrind" Surface Grinders Mk.2 (identifiable by a round cover over the grinding wheel, two main controls wheels one above the other on the face of the stand and to the right an "oval" shaped cover with a single control knob positioned centrally near the bottom ).