Playtner, H. R.
An Analysis of the Lever Escapement [recurso electrónico] / H. R. Playtner - Project Gutenberg, 2007 - Project Gutenberg 21978 .
Public domain in the USA.
Text
Clocks and watches -- Escapements
TS
An Analysis of the Lever Escapement [recurso electrónico] / H. R. Playtner - Project Gutenberg, 2007 - Project Gutenberg 21978 .
Public domain in the USA.
Text
Clocks and watches -- Escapements
TS