Acoustics - Recommended practice for the design of low-noise machinery and equipment - Part 2: Introduction to the physics of low-noise design— 50 стр.
Tractors and machinery for agriculture and forestry -- Safety-related parts of control systems -- Part 4: Production, operation, modification and supporting processes— 30 стр.
Tractors and machinery for agriculture and forestry -- Safety-related parts of control systems -- Part 1: General principles for design and development— 32 стр.
