Specifies the materials, size, hardness, weight and breaking strength of moulded white and coloured chalks of circular and other cross sections, which are intended primarily for writing on chalkboards; and also gives details of packaging and marking.
Original price was: $160.02.$80.00Current price is: $80.00.
Specification for school chalks
BSI Group , 12/31/1958
Pages: 8
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