HET AANBRENGEN VAN EEN VEILIGHEIDSLIJN OP EEN SCHUIN DAK.

作者： Borra Hans Antonius

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参考文章(5)

Flent Ballantyne, Mobile eave hook system and method ,(2009)

Clifford D. Petty, Pole safety assembly ,(2010)

Thomas Anthony Robinson, Roof safety assembly ,(1998)

Gautier Michel, Safety hooking device for roof, has hook manipulated using steering column, metallic tubes and tube assembly to position it at hooking level, and column and rotating axle manipulated by user to position hook on roof crest and chimney ,(2006)

Kent H. Baake, Roof safety device ,(2006)