Releases by H. R. Playtner

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Cover for H. R. Playtner · An Analysis of the Lever Escapement (Hardcover Book) (2013)

An Analysis of the Lever Escapement (2013)

Cover for H. R. Playtner · An Analysis of the Lever Escapement (Tredition Classics) (Paperback Book) (2013)

An Analysis of the Lever Escapem... (2013)