Device for listening through wall

Can anyone point me to any websit or provide information about how to listen to a conversation through a concrete wall?

Thanks

Reply to
stan
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Drill a hole ?:-)

...Jim Thompson

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|  James E.Thompson, P.E.                           |    mens     |
|  Analog Innovations, Inc.                         |     et      |
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Reply to
Jim Thompson

Inverted glass tumbler works nearly as well :-)

Reply to
Mjolinor

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