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GB/T 6511-1986 Precision method for free-field calibration of U23. 77mm standard condenser microphones by the reciprocity technique 
  Issued on: 1986-06-18   Price(USD): 210.0
YD/T 6491-2025  
  Issued on: 2025-07-02   Price(USD):
GB/T 14475-1993 of measurement for horn loudspeakers 
  Issued on: 1993-6-14   Price(USD): 150.0
GB/T 14475-2024 Horn loudspeakers—Measuring methods 
  Issued on: 2024-10-26   Price(USD): 735.0
GB 9396-1988 Methods of measurement for main characteristics of loudspeakers 
  Issued on:   Price(USD): 1224.0
GB/T 9396-1996 Methods of measurement for main characteristics of loudspeakers 
  Issued on: 1996-12-20   Price(USD): 1304.0
GB/T 12060.5-2011 Sound system equipment - Part 5: Methods of measurement for main characteristics of loudspeakers 
  Issued on: 2011-10-31   Price(USD): 420.0
MT 927-2004 Model KL cap lamp 
  Issued on: 2004-12-14   Price(USD): 450.0
MT 1162.4-2011 Cap lights for Use in Mines – Part 4 - Model Kl Cap lights 
  Issued on: 2011-11-16   Price(USD): 214.0
MT 26-1991  
  Issued on:   Price(USD):
MT 26-1998 Model KS miners′cap lamps 
  Issued on: 1998-07-01   Price(USD): 410.0
MT 26-2004  
  Issued on:   Price(USD): 464.0
MT 1162.2-2011 Caplights for Use in Mines. Part 2: Model KS Caplights 
  Issued on: 2011-11-16   Price(USD): 120.0
MT/T 164-2019 General technical conditions of coated fabric air duct for mine 
  Issued on: 2019-11-28   Price(USD): 255.0
MT 165-2007 Coated fabric negative pressure air duct for coal mining 
  Issued on: 2007-3-30   Price(USD): 150.0
MT 165-1995  
  Issued on:   Price(USD): 304.0
MT/T 165-2007 Coated fabric negative pressure air duct for coal mining 
  Issued on: 2007-03-30   Price(USD): 150.0
MT 164-2007 Coated fabric positive pressure air duct for coal mining 
  Issued on: 2007-03-30   Price(USD): 150.0
MT 1162.3-2011 Cap lights for Use in Mines – Part 3 - Model Kj Cap lights 
  Issued on: 2011-11-16   Price(USD): 120.0
MT 242-1998 Model KJ miners′cap lamps 
  Issued on: 1991-09-20   Price(USD): 380.0
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