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Chicago post office auto selective belt conveyor.jpg |
Chicago post office belt conveyor brassregisters.jpg |
chicago post office belt conveyor outgoing brassregisters.jpg |
chicago post office brassregisters.jpg |
Chicago post office conveyors for delivering.jpg |
Chicago post office driving mechanism.jpg |
Chicago post office overhead track conveyor.jpg |
Elgin Ill nat'l watch works 2 brassregisters.jpg |
Elgin Ill nat'l watch works 3 brassregisters.jpg |
Elgin Ill nat'l watch works brassregisters.jpg |
Elgin Ill nat'l watch works power equipment.jpg |
Elgin Ill watch works.jpg |
Elgin Ill watch works line crossing.jpg |
Elgin watch works depressed line in basement.jpg |
Elgin watch works horizontal lines.jpg |
Elgin watch works looking outside of curve.jpg |