Hi, what do you want to do?
Houghton Mifflin Harcourt
Harcourt: Biographies: Otis Boykin 1920 1982
Otis Boykin was a successful African American inventor whose inventions include resistors for electrical equipment and missiles, a controller for pacemakers, and a burglar-proof cash register.
Other
California State Polytechnic University: Women Inventors: Sarah E. Goode
The hideaway bed was originally invented by a former slave and furniture store owner, Sarah E. Goode.