Expansion Bolt

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A bolt that has an attachment that expands as the bolt is driven into a surface

Source

Government Printing Office Official Gazette (Washingon, DC: Government Printing Office, 1912)

Downloads

TIFF (full resolution)

2400×1357, 573.6 KiB

Large GIF

1024×578, 98.1 KiB

Medium GIF

640×361, 51.3 KiB

Small GIF

320×180, 19.8 KiB