Low Hertz Mules
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From: kpbosun
views 32767
The "Mules" that controled ships in the locks of the Panama Canal for the first 50 years ran on low frequency AC current,(25 CPS comes to mind but may be wrong). When Panama went over to higher frequency, these "Mules" could not be operated and were replaced with an improved model. Filename: old mules web.jpg |
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