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Derry SlotsFrank Derry designed the 'Derry Slot' modification. Derry obtained Patent # 2,384,416 on Sept. 4, 1945 for this design.
The modification was two, symmetrically placed, slots along the #4 and #25 lines. These slots made for better turning.
Derry slots were used in conjunction with other types of modifications.
Derry Slots with a Blank Gore
Derry Slots with a Loper Dog house modification
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