Mechanical Engineering

On March 16, 1909, Matilde Pionzio-Cavagnino of Turin, Italy, was granted a patent for a novel machine designed to register commercial transactions and facilitate bookkeeping. The device aimed to assist both experienced accountants and beginners.

On May 25, 1926, Opal E. Kline of Glidden, Iowa, was granted a patent for a novel light reflector. The device was designed to provide high-quality illumination, feature a cost-effective construction, and have a uniquely shaped reflector capable of evenly lighting any circular area.

On June 24, 1941, Opal W. Chase of Little Rock, Arkansas, was granted a patent for a novel awning fan. The design aimed to create a device that was easy to attach and store while maintaining a simple yet effective construction.

On April 18, 1912, Rosa Chamberlin of London, UK, was granted a patent for inventing a novel air-cooling machine. Intended for use in industrial settings, the invention featured multiple pistons and cylinders to compress air and lower the external temperature.