Rulers for drawing instruments. Specifications
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Drawing rulers. Specifications
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Drawing instruments. General technical requirements and test methods
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Drawing set-squares. Specifications
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Wooden T-squares. Specifications
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Tubular tips for hand-held technical pens using India ink on tracing paper. Definitions, dimensions, designation and marking
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Tubular tips for technical pens using India ink on tracing paper. Exploitation character and test methods
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Tubular technical pens. Adapters for compasses
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Drawing-boards. Technical conditions.
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Drawing plastic equipment. General specifications.
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