File:Research on regeneration methods of animal glue waste sand for foundry.pdf
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![File:Research on regeneration methods of animal glue waste sand for foundry.pdf](https://upload.wikimedia.org/wikipedia/commons/thumb/1/1c/Research_on_regeneration_methods_of_animal_glue_waste_sand_for_foundry.pdf/page1-413px-Research_on_regeneration_methods_of_animal_glue_waste_sand_for_foundry.pdf.jpg?20240615134505)
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