Title
Webb adderCatalog Number
X522.84Type
Physical objectDescription
Looks like two connected circlesDate
1869Manufacturer
Webb, C. H.Place Manufactured
U.S.Identifying Numbers
Model number | Webb Adder | |
Other number | November 5th 12th, 1889 | Patent Date November 5th 12th, 1889 |
Other number | on bottom Web Adder #5 | |
Serial number | 4055 |