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Overview ISO 641:1975 - Laboratory glassware - Interchangeable spherical ground joints specifies the geometric and surface requirements for spherical ground glass joints used in laboratory glassware…
Overview ISO 6411:1982 - Technical drawings - Simplified representation of centre holes defines a compact way to show centre holes on engineering drawings when the exact form and size are not require…
1 Scope and field of application This International Standard specifies the simplified representation of centre holes and their designation. Simplified representation of centre holes may be used parti…