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https://store.astm.org/e0580_e0580m-10a.html
E580/E580M Standard Practice for Installation of Ceiling Suspension Systems for Acoustical Tile and...
ceiling suspension systems
https://store.astm.org/e0580_e0580m-09a.html
E580/E580M Standard Practice for Installation of Ceiling Suspension Systems for Acoustical Tile and...
ceiling suspension systems
https://patents.google.com/patent/US3440947A/en
US3440947A - Combination diffuser and false ceiling suspension systems - Google Patents
ceiling suspension systems
combination
diffuser
false
google