seal
Why ask? Don't you know? In the first place, look at the name itself. It said "Envelope Seal" therefore it is invented by a seal(sea lion).
This is how you spell "seal" in french: seal
There are 12 different ways to seal one card in an envelope with one sticker.
he invented the envelope seal
You have spelled it correctly. "To seal" means to close securely, and "sealed" is the past tense of "to seal."
Write the words that you want to convey on a piece of paper. Fold that paper and place it in an envelope. Seal envelope. Write the address of the distributer on the center of the envelope. Place stamp in upper right hand corner of the envelope. Place the envelope in a mailbox.
The back of the envelope will be the triangular-shaped part that folds down in back; it usually has some kind of adhesive to seal the envelope (most often by moistening the strip).
Absolutely !... There is no legal requirement to enclose a letter in an envelope.
No, they are meant to decorate the back of the envelope.
Maybe, but it is so small I wouldn't worry about it.
They add interest to the cover. Do not remove the seal from the envelope, it has pretty much no value unless still on the envelope. That provides additional information such as the place that it was inspected/censored.