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| clear width | |||
| flight; passage (of bird); calibre; bore; clear opening; open space; gap; chink; lumen | |||
| opening | |||
| lumen (channel of a tube) | |||
| clear, day, face side; span; bearing distance; clear distance; inside width; clear span (Spannweite) | |||
| inner width (Rohr); width in the clear | |||
| pass | |||
| inside diameter; I.D. | |||
| inside distance between tyres; gauge of tyres | |||
| clearance | |||
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| bore (i.e. diameter); internal width | |||
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