THE MERE SUBSTITUTION OF ONE WELL KNOWN MATERIAL FOR ANOTHER IS NOT PATENTABLE. THE COMBINATION OF A PIECE OF RUBBER WITH A LEAD PENCIL NOT A PATENTABLE INVENTION. WHAT CONSTITUTES A PATENTABLE COMBINATION. NEW MECHANICAL AND ENGINEERING INVENTIONS. NEW HOUSEHOLD INVENTIONS. NEW WOODWORKING AND HOUSE AND CARRIAGE BUILDING INVENTIONS. NEW CEEMICAL AND MISCELLANEOUS INVENTIONS., scientific american, 1876-07-01
THE MERE SUBSTITUTION OF ONE WELL KNOWN MATERIAL FOR ANOTHER IS NOT PATENTABLE. THE COMBINATION OF A PIECE OF RUBBER WITH A LEAD PENCIL NOT A PATENTABLE INVENTION. WHAT CONSTITUTES A PATENTABLE COMBINATION. NEW MECHANICAL AND ENGINEERING INVENTIONS. NEW HOUSEHOLD INVENTIONS. NEW WOODWORKING AND HOUSE AND CARRIAGE BUILDING INVENTIONS. NEW CEEMICAL AND MISCELLANEOUS INVENTIONS., scientific american, 1876-07-01
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