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นำเข้าจาก en.wikipedia มายังคอมมอนส์ โดย Maksim

This is a scan of a Pickett pocket slide rule, done by me, Benjamin Crowell, in 2005. The slide rule does not have a copyright notice on it, and works published in the U.S. without a copyright notice before 1977 are in the public domain. I therefore think the slide rule itself is in the public domain under U.S. law. I'm making my scan available under the GFDL license.

อนุญาตให้คัดลอก แจกจ่ายและ/หรือแก้ไขเอกสารนี้ภายใต้เงื่อนไขของสัญญาอนุญาตเอกสารเสรีของกนู รุ่น 1.2 นี้ที่ออกโดยมูลนิธิซอฟต์แวร์เสรี โดยไม่มีส่วนใดห้ามแก้ไข ไม่มีข้อความปกหน้าและปกหลัง สำเนาของสัญญาอนุญาตรวมอยู่ในส่วนชื่อ สัญญาอนุญาตเอกสารเสรีของกนู

1.2 เท่านั้นhttp://www.gnu.org/licenses/old-licenses/fdl-1.2.htmlGFDL 1.2GNU Free Documentation License 1.2truetrue

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• (del) (cur) 19:33, 23 April 2005 . . en:User:Bcrowell Bcrowell ( en:User_talk:Bcrowell Talk) . . 558x152 (20510 bytes) (This is a scan of a Pickett pocket slide rule, done by me, Benjamin Crowell, in 2005. The slide rule does not have a copyright notice on it, and works published in the U.S. without a copyright notice before 1977 are in the public domain. I therefore think)
• (del) (rev) 19:24, 23 April 2005 . . en:User:Bcrowell Bcrowell ( en:User_talk:Bcrowell Talk) . . 634x174 (25206 bytes) (This is a scan of a Pickett pocket slide rule, done by Benjamin Crowell in 2005. The slide rule does not have a copyright notice on it, and works published in the U.S. without a copyright notice before 1977 are in the public domain. I therefore think the )
• (del) (rev) 19:18, 23 April 2005 . . en:User:Bcrowell Bcrowell ( en:User_talk:Bcrowell Talk) . . 652x203 (27548 bytes) (This is a scan of a Pickett pocket slide rule, done by Benjamin Crowell in 2005. The slide rule does not have a copyright notice on it, and works published in the U.S. without a copyright notice before 1977 are in the public domain. I therefore think the )