TY  - SER
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;  Text
UR  -  http://www.gutenberg.org/ebooks/21978
ER  -