Electric master clock of the half minute impulse type by Gillett and Johnston
Electric master clock of the half minute impulse type by Gillett and Johnston, patented 1923
- Object Number:
- 1983-887 Pt1
- type:
- clocks
Electric master clock of the half minute impulse type by Gillett and Johnston, patented 1923 with pendulum
Electric master clock of the half minute impulse type by Gillett and Johnston, patented 1923
Pendulum for electric master clock