   My Own Right Time an Exploration of Clockwork Design (Hardcover) ISBN-13: 9780198565222 ISBN-10: 0198565224 Genres: Crafts, Hobbies & Home, Science & Math, Engineering & Transportation, Substores ?  Study of the Spiral Hairspring with a New Evaluation of Its Elastic Properties (Paperback) ISBN-13: 9780950962153 ISBN-10: 0950962155 ? |
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