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1. |
[n]
[uk]
▶ balance spring ▶ hairspring |
2. | A 2017-06-18 07:49:09 Jim Breen <...address hidden...> | |
1. | A* 2017-06-17 11:23:34 Robin Scott <...address hidden...> | |
Refs: | gg5, daijr/s https://en.wikipedia.org/wiki/Balance_spring |