TY  - BOOK
AU  - Playtner,H.R.
TI  - An Analysis of the Lever Escapement
AV  - TS 
PY  - 2007///
PB  - Project Gutenberg
KW  - Clocks and watches -- Escapements
N1  - Public domain in the USA; Electronic text
UR  - http://www.gutenberg.org/ebooks/21978
ER  -