8/6/2023 0 Comments Plaster of paris moldsOriginal Assignee JAMES C HEINTZ Co Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number US247728A Inventor Company The Cleveland Trust Current Assignee (The listed assignees may be inaccurate. Google Patents Use of plaster of paris forms in making metal castingsÄownload PDF Info Publication number US2766498A US2766498A US247728A US24772851A US2766498A US 2766498 A US2766498 A US 2766498A US 247728 A US247728 A US 247728A US 24772851 A US24772851 A US 24772851A US 2766498 A US2766498 A US 2766498A Authority US United States Prior art keywords plaster paris metal forms chill Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents US2766498A - Use of plaster of paris forms in making metal castings US2766498A - Use of plaster of paris forms in making metal castings
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