San Francisco : Architect and Engineer, Inc · leaf 777
embers may not test up toreciuirements. There are untjuestionably matters ofthe economical field control of concreteproportioning, mixing, placing and cur-ing which would put the builder under asevere handicap, making lawsuits almosta certainty, if he had to guarantee say2000 lbs., strength on… … Robertson Process VENTILATORS These long barreled ejector type ven-tilators are shown by the CarnegieInstitute of Technology tests to pro-vide maximum air currents under allconditions. H. H. ROBERTSON CO. 1007 Hcbart Bldg., San FranciscoTelephone Garfield 522 pOBERTSONCfp XVPROCESS WSJALMt, FOR…
Architecture · Building
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