1900 - Thomas Lambert developed a successful method of mass-duplicating "indestructible" cylinders of celluloid; his patent 645,920 described making a copper negative matrix by electrolysis from a wax master, and using heat and pressure to "mould" durable celluloid copies from the matrix. Although Lambert's patent was upheld by the courts, Edison would use expensive lawsuits to drive Lambert's company and the Indestructible Phonograph Record Company out of business by 1907.