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(a) Two self-spacing frames; one of them fitted with a sheet of foundation.
(b) An empty super, showing the springs and the wedge-shaped piece at the end.
(c) The Doolittle division-board feeder.
PLATE XII
(a) Two self-spacing frames; one of them fitted with a sheet of foundation.
(b) An empty super, showing the springs and the wedge-shaped piece at the end.
(c) The Doolittle division-board feeder.
PLATE XII
