TY  - BOOK
AU  - Stevenson,Douglas K.
TI  - Historical German patents & torsion pendulum clocks
PY  - 2002///]
CY  - Essen, Germany
PB  - Ruhrei Verlag
KW  - Clocks and watches
KW  - Germany
KW  - Patents
KW  - 19th century
KW  - 20th century
KW  - Torsion pendulum
KW  - Clock (general)
KW  - patent
KW  - torsion
KW  - Stevenson, Douglas K
KW  - Ruhrei
ER  -