Some names are complete nonsense: why is Benjamin Banneker there for building a mechanical clock in the 1800s (when such things were already everywhere) while P

Some names are complete nonsense: why is Benjamin Banneker there for building a mechanical clock in the 1800s (when such things were already everywhere) while Phillip Hahn (who build a four-operation mechanical calculator) in the 1700s is not? They added Katherine Johnson who developed no new theories or applications on Math or Computer Science, but left Margaret Hamilton out (and she was the pioneer and creator of an entire new field!)