The system I’m describing is a horizontal system in that two colonies are placed side by side so they can share a common set of supers. The colonies stay physically separate although I prefer to join the bottom boards with screws. This ensures both sets of brood chambers are at identical heights even if the assembly is placed on a slightly uneven surface.
The Two-queen Horizontal System
by Bill Hesbach
The Horizontal Two-Queen System_Bee Culture
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