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VDI/VDE 2041:1991-04 (R2001) Measurement of fluid flow with primary devices; orifice plates and nozzles for special applications
VDI 3726:1991-01 Noise reduction in restaurants and skittle-alleys
VDI 2520:1990-12 Installation of logistics organisation; working method
VDI 3862 Blatt 1:1990-12 (R2017) Gaseous emission measurement; measurement of aliphatic aldehydes (C1 to C3) MBTH method
VDI 2453 Blatt 1:1990-10 (R2016) Gaseous air pollution measurement; determination of nitrogen dioxide concentration; photometric manual standard method (Saltzmann)
VDI 3731 Blatt 2:1990-11 Characteristic noise emission values of technical sound sources; fans
VDI/VDE 2252 Blatt 9:1990-06 (R2001) Precision engineering components; guides; spring joints
VDI/VDE 2254 Blatt 1:1990-09 Precision engineering components; rotating couplings; permanent couplings
VDI 3783 Blatt 2:1990-07 (R2015) Environmental meteorology; dispersion of heavy gas emissions by accidental releases; safety study
VDI/VDE 2259:1990-06 (R2001) Precision engineering components; indicating components; scales, symbols, pointers
VDI 2263 Blatt 1:1990-05 (R2003) Dust fires and dust explosions; hazards, assessment, protective measures; test methods for the determination of the safety characteristic of dusts