Playtner, H. R. [from old catalog] · Chicago, Hazlitt & Walker · leaf 26
Fig. 9. the lifting planes on the teeth are also curved. See Fig.11. This is decidedly an ingenious arrangement, and isin strict accordance with scientific investigation. Weshould see rnany fine watches made with such escape-ments if the means for producing them could fully satisfythe requirements…
Clocks and watches
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