Original laboratory trade vintage catalog for CALCULAGRAPH COMPANY. Main office and factory was located at 50 Church Street, New York City, NY and the factory was in Harrison, NJ. Manufacturers of The Elapsed Time Recorder. For computing and recording the period between the start and finish of any job. Unbound from a large 1931 engineering catalog, this unique old one page technical specifications brochure would exhibit beautifully matted and framed. A fantastic addition to your retro industrial instrument collection. Slight damp stain on outer edge.