The Variant and Subvariant structure is unique to hobbyDB and helps organize the database. Learn more by reading
What is a Variant
and
What is a Subvariant
in our help section.
Hand Pumper
The Variant and Subvariant structure is unique to hobbyDB and helps organize the database. Learn more by reading
What is a Variant
and
What is a Subvariant
in our help section.
Working model of an early hand pumper. Hand pumping pressurizes the hose.