For franked mail, a dedicated franking machine is used. There are a number of companies offering postage meters, also called franking machines. During the 1990s, Israel experimented with vending machines for postal labels (franking labels). The slogan was used on postal franking from the affected authorities. The prevailing system of physical stamp paper/franking is being replaced by E-stamping system. Companies decide what proportion of the dividends they pay will have franking credits attached. One dollar of company tax paid generates one franking credit. A company is not obliged to attach franking credits to its dividends. Franking credits are passed on to shareholders along with dividends. The franking credit is then credited against the tax payable on their income. This may be accomplished by "imputation systems" or franking credits. These franking credits represent the tax paid by the company upon its pre-tax profits. Since then, the franking of congressional mail has been subject to ongoing review and regulation. In 1802 Congress passed a law that specifically extended franking privileges and pay to delegates. The act also provides former presidents with travel funds and franking privileges.