GOST 21138.4-85

Lasers and laser-related equipment. Test methods for laser beam widths, divergence angles and beam propagation ratios. Part 3. Intrinsic and geometrical laser beam classification, propagation and details of test methods

Systems for transfer of notices about fire. Guidance on the design, installation, maintenance and repair. Performance test methods

Boiled oils. General specifications

Electric and optical fibre cables. Test methods for non-metallic materials. Part 508. Mechanical tests. Pressure test at high temperature for insulation and sheaths

Bitumens and bituminous binders. Determination of dynamic viscosity

Uniform provisions concerning the approval of filament lamps for use in approved lamp units of power-driven vehicles and of their trailers