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| The line current is usually too small to activate the wheel raising; so a secondlocal circuit is used with a local battery. The relay shown is activated by the line current and opens/closes the local circuit. | |
| Total images: 13 | Help | |
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| The line current is usually too small to activate the wheel raising; so a secondlocal circuit is used with a local battery. The relay shown is activated by the line current and opens/closes the local circuit. | |
| Total images: 13 | Help | |