A slot-doorbellthat was what frugal Dutch huisfronwen were having carpenters install last week beside their furiously polished brass doorknobs.
The slot-doorbell, introduced into The Netherlands but a short time ago, has swiftly become a best seller. Instead of ringing the house bell one drops a Dutch cent* into the slot, and when the intelligent mechanism has verified that the object dropped is a cent it goes "Bong!"
When the prim Dutch maid opens the door and sees that a friend of the family is calling she returns the cent to the welcome guest. But...
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