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You searched for: “Spafford, Horatio Gates; and patents and patent system”
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Spafford, Horatio Gates; and patents and patent system [index entry] 
Spafford, Horatio Gates; and patents and patent system [index entry] 
Spafford, Horatio Gates; and patents and patent system [index entry] 
Spafford, Horatio Gates; and patents and patent system [index entry] 
Spafford, Horatio Gates; and patents and patent system [index entry] 
Spafford, Horatio Gates; and patents and patent system [index entry] 
Spafford, Horatio Gates; and patents and patent system [index entry] 
Spafford, Horatio Gates; and patents and patent system [index entry]