Can anyone point me to any websit or provide information about how to listen to a conversation through a concrete wall?
Thanks
Can anyone point me to any websit or provide information about how to listen to a conversation through a concrete wall?
Thanks
Drill a hole ?:-)
...Jim Thompson
-- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et |
Inverted glass tumbler works nearly as well :-)
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