Karen writes:
> can you send me a picture or a diagram?

SEE:
A Modified Two-queen System: “Tower” Colonies Allowing for Easy Drone Brood Removal for Varroa Mite Control 
Dennis van Engelsdorp, Shane Gebauer & Robyn Underwood
http://www.beeculture.com/content/ScienceJournalFebruary2009.pdf

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