TY  - BOOK
AU  - H. R. Playtner
TI  - An Analysis of the Lever Escapement
KW  - Technology
UR  - https://new.zodml.org/sites/default/files/2023-06/an_analysis_of_the_lever_escapement_by_h._r._playtner_tag_clocks_and_watches_escapements_0.epub
ER  -