A bill to reduce certain duties, to suspend temporarily certain duties, to extend certain existing suspensions of duties, and for other purposes.

[AI summary unavailable — showing source text] Amends the Tariff Schedules of the United States to revise the tariff treatment of various articles. Excludes from the tariff on canned tuna any tuna produced by insular possessions. Reduces and sets a schedule for further reducing the duty on ceramic insulators used in spark plugs for internal combustion engines. Repeals the temporary reduction of the duty on ceramic insulators having a specified alumina oxide content and used in spark plugs. Schedules reductions in the duty on chipper knife steel between 1982 and 1986. Repeals the temporary tariff reduction on such steel. Makes permanent the duty-free treatment of Yankee dryer cylinders. Exempts from duty aircraft components and materials contained in an aircraft which was: (1) previously exported from the United States; (2) composed, at the time of its exportation, of components and materials made and installed in the United States; (3) returned to the United States without having been improved; and (4) entered for use in the United States before 1970. Extends duty-free treatment to pipe organ parts and ceramic toy tea sets. Increases the value limitations for duty-free importations of articles: (1) accompanying a U.S. resident …