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Filter: Subject of heating and ventilation industry
Filter: Community of Chicago
| Date: | 1939 |
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| Description: | Factory workers take samples from the 8-ton Brackelsberg Furnace at McCormick Works. The original caption reads: "Furnace has three tap spouts. Large insul... |
| Date: | 07 23 1912 |
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| Description: | Elevated view of two men working in a boiler room. |
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