An analysis of the lever escapement : a lecture delivered before the Canadian Watchmakers' and Retail Jewelers' Association /
Playtner, R. H.,
An analysis of the lever escapement : a lecture delivered before the Canadian Watchmakers' and Retail Jewelers' Association / R.H. Playtner. - [First edition]. - 88 pages, plates : illustrations, portrait ; 15 cm
Clocks and watches--Escapements.
Escapmentscie Canada Lever Escapement theoretical Watch (general)
An analysis of the lever escapement : a lecture delivered before the Canadian Watchmakers' and Retail Jewelers' Association / R.H. Playtner. - [First edition]. - 88 pages, plates : illustrations, portrait ; 15 cm
Clocks and watches--Escapements.
Escapmentscie Canada Lever Escapement theoretical Watch (general)