About this document
Advantages of the Hanke-Henry Calendar by Leyla Mammadova is a document available to read on EtoBox.
The document discusses two inventors, Andrew Beard and Frederick Jones, who were African American. It notes that Beard invented an automatic train car coupler in 1897 that improved safety, and Jones invented a mobile refrigeration system in 1938 that allowed food to be transported farther.
- Author
- Leyla Mammadova
- Language
- EN