(provided for in subheading 7106.92.50) Free No change No change On or before 12/31/2020 . 1370. Strips consisting of silver and tin Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.14.89 Silver in semimanufactured form, containing by weight 87 to 89 percent of silver, 11 to 13 percent of tin and 0.1 to 0.7 percent of copper oxide, presented in the form of strip and certified by the importer as suitable for use in electrical contact systems intended for the manufacture of switches and relays (provided for in subheading 7106.92.50) Free No change No change On or before 12/31/2020 . 1371. Gauzes made of precious metal Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.14.90 Gauzes containing platinum, palladium and rhodium (provided for in subheading 7115.10.00) Free No change No change On or before 12/31/2020 . 1372. Strips consisting of silver, copper, and zinc Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.14.91 Clad strips of silver, further worked than semimanufactured, each containing 54 percent or more but not over 56 percent by weight of silver