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Forces

Stationery Is
env3

Envelope. United States. 1853. 3 cents.
swedenpc

Postal card. Sweden. 1897. 5 ore.
franceppc

Pneumatic post card. France. 1884.
chinaprompt

Prompt delivery envelope. Republic of China. 1969.

The prompt delivery service was inaugurated on August 1, 1956. Such mail must be delivered within 2 hours of receipt by the delivery office.