H.R.Playtner
H.R.Playtner

H.R.Playtner

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An Analysis of the Lever Escapement
H.R.PlaytnerAn Analysis of the Lever Escapement

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Henry Hunt Snelling•George William Septimus Piesse•Sir Frederick Hugh Sykes•Ethel M.Mairet•Edward Godfrey•Sir Charles Alexander Cameron•F.H.King•James H.Maggard•Joseph M. Walsh•William Hemmingway Mills
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