Usage of "upper ascender"

Encara no tenim significats per a "upper ascender".

Ús de upper ascender en anglès

This way I can quickly remove my upper ascender to pass pieces while cleaning. 
 Climbing Magazine 

On traversing terrain, I'll also top-clip the upper ascender to prevent it from coming off unexpectedly. 
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You should be able to sit on the upper ascender and reach it without pulling with that arm. 
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Stand in both ladders and pull on the lower ascender while pushing the upper ascender as high as possible. 
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Slide the lower ascender up and repeat until you can sit on the upper ascender with no rope stretch. 
 Climbing Magazine 

Sit on the upper ascender; lift both legs to slide the lower ascender up underneath as high as you can. 
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Slide the upper ascender as high as possible while also pulling down on the lower ascender or stepping into the lower etrier. 
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To operate the system, turn the upper ascender away from your body, and put both hands on top (Figure 2). 
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Your upper ascender is attached to your harness by a daisy, with a foot loop tied from one-inch tubular webbing (Figure 1). 
 Climbing Magazine 

upper

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Significats de upper ascender en anglès