N.29

SAS Surface Air System History

DATE NAME CHARACTERISTICS 1976 BAPD Slit to agar model 1977 BC SAS Anderson type air sampler 1978 SAS Prototype 1979 SAS Surface Air System Metal case with separate heavy battery metal case 1982 SAS Compact Metal body with incorporated heavy battery 1984 MTM-3 Stationary unit with 3 aspirating head 1992 SAS Super 90 Plastic.

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