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PP is as hard as the polynomial-time hierarchy
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Tape activated piano and organ player
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Metodo y aparato para discriminar y contar documentos.
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Bar code recording and reproducing system
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A definite clause version of categorial grammar
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The nearly ultimate pearl
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Device for checking registration of an amount of money in money dispensers
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Evaluation of tests and grouping of cultures by a two-stage principal component method
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Pipe organ
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Axiomatizability in inclusive equational logics
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Piano or a Key-instrument similarly Built with an Automatic Play Organism.
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A New or Improved Cash Change Rack.
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Electronic pocketbook for secret memorandum
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Cash register
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Method of Synthesis of New Information
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Improvements connected with Coin-in-the-slot Machines.
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" The American Dance Band Discography, 1917-1942", by B. Rust (Book Review)
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Feeling and Form: A Theory of Art Developed from Philosophy in a New Key
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Propositional Languages
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Instruments and the Electronic Age