Dust Collector

Author:  Eugene Bretney
Source:  US Patent 438,523
Doc ID:  1890000
Year of Publication:  1890
Abstract:  
To all whom it may concern: Be it known that I, Ambrose G. Warren, of Massachusetts, have invented a new improvement in Sand-blast Apparatus; and I do hereby declare the following, when taken in connection with the accompanying drawings and the letters of reference marked thereon, to be a full, clear, and exact description of the same and which said drawings constitute part of this specification and represent in a top or plan view of my improved hopper with the grate and screen and dust pipes removed.....