Dave Cushman wrote:

 The same sort of chip that is used to identify pet dogs and cats could
 surely be used on the back of a queen?
 Hello Dave and all,
This subject has been talked about many times over the years.  If you
are inventing a useful beekeeping tool invent a queen zapper.  Push a
button from your office and zap all your old queens and requeen from
your office.
Tip for finding queen:
Watch for circle about the size of half dollar U.S. moving across the
frame instead of trying to look at each bee.
Happy beekeeping!
Bob Harrison