Hole punch (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Hole punch" in English language version.

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appletonideas.com

"Appleton Standard Layout" (PDF). Archived from the original (PDF) on 2013-11-26. Retrieved 2013-02-12.

Xaver Frühbeis (14 November 2000), Renate von Walter (ed.), Geburtstag des Lochers [Birthday of the Punch] (RTF) (in German), Bayerischer Rundfunk, archived from the original (RTF) on 2004-09-02

Markus Kuhn (2018-07-13), International standard paper sizes, archived from the original on 2021-12-05, retrieved 2019-08-08, Not specified in ISO 838, but also widely used, is an upwards compatible 4-hole system. Its two middle holes correspond to ISO 838, plus there are two additional holes located 80 mm above and below these to provide for more stability. This way, sheets with four punched holes can also be filed in ISO 838 2-hole binders. This system is also known under the nickname "888", presumably because the three gaps between the holes are all 8 cm wide.

131st Anniversary of the Hole Puncher, Drawing by Gerben Steenks, 14 November 2017, archived from the original on 2021-08-20, retrieved 14 November 2017{{citation}}: CS1 maint: others (link)

Clark Mindock (13 November 2017), "Hole punch history: How the world became more organised in a single thadumph", The Independent, archived from the original on 2020-04-21, retrieved 2021-12-22

"Soennecken", Poppelsdorfer Heimatsammlung Stöcker, Photographs by Helmut Uessem, 2001-04-23, archived from the original on 2011-07-19, retrieved 2008-02-14{{citation}}: CS1 maint: others (link)

SS 62 81 02: Dokumentförvaring – Fästhål för dokument [SS 62 81 02: Document Retention – Holes for Filing Purposes] (in Swedish), Svenska institutet för standarder [Swedish Institute for Standards], 2006-06-06, retrieved 2020-08-07

Xaver Frühbeis (14 November 2000), Renate von Walter (ed.), Geburtstag des Lochers [Birthday of the Punch] (RTF) (in German), Bayerischer Rundfunk, archived from the original (RTF) on 2004-09-02
"Soennecken", Poppelsdorfer Heimatsammlung Stöcker, Photographs by Helmut Uessem, 2001-04-23, archived from the original on 2011-07-19, retrieved 2008-02-14{{citation}}: CS1 maint: others (link)
131st Anniversary of the Hole Puncher, Drawing by Gerben Steenks, 14 November 2017, archived from the original on 2021-08-20, retrieved 14 November 2017{{citation}}: CS1 maint: others (link)
Clark Mindock (13 November 2017), "Hole punch history: How the world became more organised in a single thadumph", The Independent, archived from the original on 2020-04-21, retrieved 2021-12-22
Markus Kuhn (2018-07-13), International standard paper sizes, archived from the original on 2021-12-05, retrieved 2019-08-08, Not specified in ISO 838, but also widely used, is an upwards compatible 4-hole system. Its two middle holes correspond to ISO 838, plus there are two additional holes located 80 mm above and below these to provide for more stability. This way, sheets with four punched holes can also be filed in ISO 838 2-hole binders. This system is also known under the nickname "888", presumably because the three gaps between the holes are all 8 cm wide.
"Appleton Standard Layout" (PDF). Archived from the original (PDF) on 2013-11-26. Retrieved 2013-02-12.