File:“Gibbs’ Patent Dust Protector, Gibbs Respirator Company 30-36 La Salle Street, Chicago - The American elevator and grain trade (IA CAT31053470064) (page 41 crop).jpg
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“Gibbs’_Patent_Dust_Protector,_Gibbs_Respirator_Company_30-36_La_Salle_Street,_Chicago_-_The_American_elevator_and_grain_trade_(IA_CAT31053470064)_(page_41_crop).jpg (758 × 516 pixels, file size: 94 KB, MIME type: image/jpeg)