One will buy a franking machine because they want to save money
on postage. One will get discounted postage when one uses a
franking machine. One can buy a franking machine when one goes to
the website of Royal Mail.
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A franking machine prints postage on enevelopes; also known as a
postal meter.
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A franking machine is used to print postage on letters; also known as a postal meter.
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"Franking" is the practice of allowing legislators to send mail
through the postal system without paying postage.