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Document Designation and Title Year Select Item(s) D229 Standard Test Methods for Rigid Sheet and Plate Materials Used for Electrical Insulation 09a D229 Standard Test Methods for Rigid Sheet and Plate Materials Used for Electrical Insulation 09 D229 Standard Test Methods for Rigid Sheet and Plate Materials Used for Electrical Insulation 01 D229 Standard Test Methods for Rigid Sheet and Plate Materials Used for Electrical Insulation 96