| http://www.w3.org/ns/prov#value | - General examples of putter alignment devices or structures for providing a visual indicator to the golfer are shown in U.S. Pat. No. 3,033,574 to Partridge, U.S. Pat. No. 3,118,678 to Rohr, U.S. Pat. No. 3,199,873 to Surratt, U.S. Pat. No. 3,333,854 to White, U.S. Pat. No. 4,762,324 to Anderson, and U.S. Pat. No. 5,409,228 to Botsch.
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