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The machines used to handle mailing operation are called mailing machines. There are different types of mailing machines.
These are :
1. Letter opening machine — These machines are used to open letters and 100 to 500 letter can be opened per minute.
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2. Folding machine —These machines are used to fold papers into envelope. This machine can fold 10,000 to 20,000 papers per hour.
3. Sealing machine — This machine is used to seal the envelopes.
4. Mailing machine — A machine which combines mailing operation like folding up envelopes and sealing of envelopes is known as mailing machine. This machine is of great use in case of circulars.