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Ooops, one should really not believe that internet! Thanks for the correctionThat is a power trowel, not a Vibrator!
A power trowel (also known as a "power float" and "troweling machine") is a piece of light construction equipment to apply a smooth finish to concrete slabs. There are two types of power trowels, ride-on power trowels and walk-behind power trowels.
The information on this website (Item 16) is wrong:https://www.thebalancesmb.com/concrete-contractor-tools-844980