Which of the following devices is used for the formation of shell mould in the shell moulding procedure?

Which of the following devices is used for the formation of shell mould in the shell moulding procedure? Correct Answer Dump box

A silicone release agent is sprayed on the heated metallic pattern which is fixed to a dump box, wherein the coated sand of sufficient amount is filled in. Then the dump box is rotated so that the coated sand falls on the heated pattern and the heat liberating from the pattern melts the resin and causes sand mixture to adhere to the pattern.
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