TY  - BOOK
AU  - Gros,Charles
TI  - L'échappement à ancre de Graham
PY  - 1913///]
CY  - Paris
PB  - Desforges
KW  - Graham, George,
KW  - Clocks and watches
KW  - Escapements
KW  - advanced theory escapement
KW  - Desforges, Girardot et Cie
KW  - Gros, Charles
KW  - Graham Anchor
KW  - Clock (general)
ER  -