Silver crushed, smelted and casted into bars at silver mine in Queretaro, Mexico.
Queretaro Mexico Date:1928 Duration:2 min 4 sec Sound:NO SOUND
Describes raw materials used in telephone manufacturing. The map shows a location of Queretaro in Mexico. Workers collect molten silver pouring from a huge bowl at a smelter. Silver ore is crushed in a huge stone crusher. Workers load ore bags on their backs. Workers stack slabs of silver.
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