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Description
Text below photograph reads: A gang of men were kept working continually on the jacks, raising the form about 1/2 inch every eight to ten minutes. Approximately 150 jacks were necessary to raise entire form.
Business and Industry Poultry Producers of Central California 1937 Grain elevators Construction projects Concrete construction--Formwork Concrete construction United States California Sonoma Petaluma East Washington Street
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