There is no such power known as "legal rubber stamp"
authority.
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If your like history, here's a great online article about the
invention of the rubber stamp.
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You can create a personalized rubber stamp with your business
logo on it using the 'Stamp design Wizard'. Customize one for your
company at RubberStamps.com.
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Rubber stamp crafts are popular because they are easy to learn
and use, inexpensive and versatile. Artists at all levels can
create crafts using rubber stamp techniques.
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a rubber stamp congress means that any law or change made by the
president would be passed most of the time.