New Improvements in Staples, Security Seals, particularly applicable to the tender Securities, letters, Parcels, etc., positioned by hand without any Tool.

• 1. Security letter box for parcels and letters - has parcel compartment made inaccessible by presence of parcel [P] . 瑞士专利： CH583544A5 . 1977-01-14

  机译： 包裹和信件的安全信箱-包裹的存在使包裹箱无法进入

• 2. Security measure applicable to Security documents printed on Substrates without Optical Brightener containing encoded information variable [P] . AR096877A1 . 2016-02-03

  机译： 适用于在没有荧光增白剂的情况下打印在基材上的安全文件包含编码信息变量的安全措施

• 3. Electromechanical letter and parcel dispenser with security function [P] . 德国专利： DE202020001405U1 . 2020-09-10

  机译： 具有安全功能的机电信件和包裹分发器

• 1. Improvement of Tender Security in Construction in China [C] . Wang LP Proceedings of 2010 international symposium on construction economy and management. . 2010
• 2. Sport safety improvement using security camera without audience privacy violation [O] . Praditsathaporn Suriya, Kaviya Somkuan, Yupapin Preecha P. 2010
• 3. Kuwait Contractors Working in Sensitive Positions Without Security Clearances or CACs [R] . 2010