Illustrations, W-grate (BS) Mark 6 water-cooled
The water flow system of the patented (BS) Mark 6 water-cooled w-grate.
| W-grate (BS) Mark 5 Air-cooled |
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| W-grate (BS) Mark 6 Water-cooled |
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| W-grate (Vølund) Air-cooled |
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| W-grate (Vølund) Water-cooled |
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