Home › Our Collection › LOCKE ADDERLOCKE ADDERInventorClarence E. LOCKEInvention date1901Manufacturing date1901 onwardsManufacturing locationKensett, Iowa, USAManufacturerC. E. Locke Mfg. Co.DimensionsL 13 H 6 P 1Reference NumberUnknownContact UsPinwheel Multiplier