This part of GB/T 13877 specifies the terms and definitions used in performance evaluation standards and test method standards for enclosed cabs of agricultural and forestry tractors and self-propelled machinery.
GB/T 13877.1-2003 history
2003GB/T 13877.1-2003 Tractors and self-propelled machines for agriculture and forestry--Operator enclosure environment--Part 1: Vocabulary