Lloyd J. Harris Pie Co., “High Pressure Steam Jacket Aluminum Kettles,” Digital Collections, accessed December 12, 2025, https://digitalcollections.library.gvsu.edu/document/44578.
A photo of the high pressure steam jacket aluminum kettles, which is being operated by a man who is stirring something in the kettle, and the pie pan washer, which is being operated by a woman. The caption reads: "All custards, fillings for cream pies, etc. are cooked in thes emodern aluminum steam controlled kettles."