1. Short title This Act may be cited as the Semiquincentennial Congressional Time Capsule Act . 2. Semiquincentennial Congressional Time Capsule (a) Creation by Architect of the Capitol The Architect of the Capitol shall create a Congressional time capsule, to be known as the Semiquincentennial Congressional Time Capsule (in this Act referred to as the Time Capsule ). (b) Contents (1) Determination by congressional leadership The Office of the Speaker of the House of Representatives, Office of the Minority Leader of the House of Representatives, Office of the Majority Leader of the Senate, and Office of the Minority Leader of the Senate shall jointly determine the contents of the Time Capsule, taking into account the requirements of paragraph (2). (2) Specifications The contents of the Time Capsule shall include— (A) a representative portion of all books, manuscripts, miscellaneous printed matter, memorabilia, relics, and other materials relating to the United States Semiquincentennial; (B) copies or representations of important legislative and institutional milestones of Congress during the time before the Time Capsule is buried; (C) a message from Congress to the future Congress when the Time Capsule will be opened