108-02014
OLD FURNACE SAVING ENERGY
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108-02014
OLD FURNACE SAVING ENERGY
600-01739
U.S. PATENT FEEDING AND DISCHARGING ROASTER ORE
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600-01739
U S PATENT FEEDING AND DISCHARGING ROASTER ORE
353-04374
CHANGING FURNACE FILTER HOME SAFETY CLEAN AIR
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353-04374
CHANGING FURNACE FILTER HOME SAFETY CLEAN AIR
600-01122
Primitive furnace metal Tool producing Bronze Age
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600-01122
Primitive furnace metal Tool producing Bronze Age
353-02843
Sussexite - Zinc Franklin Furnace Nj.
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353-02843
Sussexite Zinc Franklin Furnace Nj
264-02223
OLD REGULATOR VALVE ON GAS FURNACE LEAK HAZARD
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264-02223
OLD REGULATOR VALVE ON GAS FURNACE LEAK HAZARD
264-02224
OLD VALVE ON GAS FURNACE POSSIBLE LEAK HAZARD
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264-02224
OLD VALVE ON GAS FURNACE POSSIBLE LEAK HAZARD
169-00002
SLAGGING OPERATION ALUMINUM PRODUCTION
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169-00002
SLAGGING OPERATION ALUMINUM PRODUCTION
169-00003
SMALL IRON FURNACE BURNING OFF IMPURITIES
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169-00003
SMALL IRON FURNACE BURNING OFF IMPURITIES
169-00010
MOLTEN IRON TAPPED FROM FURNACE INTO LADLE
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169-00010
MOLTEN IRON TAPPED FROM FURNACE INTO LADLE