The affirmative requirement for bonding the specified personnel is applicable only if they handle “funds or other property” of the labor organization or trust concerned. A consideration of the purpose of section 502 and a reading of the section as a whole, including provisions for fixing the amount of bonds, suffice to show that the term “funds or other property”, as used in this section of the Act, encompasses more than cash alone but that it does not embrace all of the property of a labor organization or of a trust in which a labor organization is interested. The term does not include property of a relatively permanent nature, such as land, buildings, furniture, fixtures and office and delivery equipment used in the operations of a labor organization or trust. It does, however, include items in the nature of quick assets, such as checks and other negotiable instruments, government obligations and marketable securities, as well as cash, and other property held, not for use, but for conversion into cash or for similar purposes making it substantially equivalent to funds.