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A pen holder for installation whereever a pen is constantly required for signing a visitor's book, an engineering log, or a register.
The base unit contains a voice synthesis system, an RFID-type detector, and a speaker and amplifier.
A passive RFID-type transponder is attached to or installed
in the pen, and "paired".
If the pen is moved out of range of the holder, say, a metre, the penholder starts to shout, "Hey ! Put the pen back ! You there ! HEY, EVERYONE, STOP THIEF ! THEY'RE STEALING THE PEN !"
||I would like a pen that started leaking when it was taken too far from its base.
||a leek might make a great holder.
||Ha! - I just read your annotation  - funny.