Lamb and Ritchie Co.; Manufacturers of Sheet Metal Pipe of Every Description, Metal Specialties; Cambridge, Mass.; David A. Ritchie, president; Fred E. Ritchie, treasurer; Roy. L. Cummings, secretary; Please Address All Correspondence to the Company; cable address: "Laritch" Boston; Letterhead contains an image of the Lam and Ritchie manufacturing complex
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Letterheads, Factories, Sheet-metal work, Metal-working industry, Cambridge (Mass.), Massachusetts, New England