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US4096681A
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Fastener for retaining sheet cladding
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GB1531821A
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Fastener for retaining sheet cladding
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US3789181A
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Method of spirally winding strip metal about a pipe, and securing adjacent strips by welding
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US3715557A
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Method of, and apparatus for spirally winding strip metal about a pipe, and securing adjacent strips by welding
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US3353319A
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Method of making sheet-metal roof coverings and roof covering made in accordance with this method
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ES307314A3
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A procedure for roofing buildings with sheet. (Machine-translation by Google Translate, not legally binding)
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GB1048942A
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Welding machine for seam flanges of metallic sheets
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CA743335A
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Method of making sheet-metal roof coverings
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