It made all existing bombers completely obsolete. Its speed and firepower rendered all existing battleships obsolete. Folklore is no longer circumscribed as being chronologically old or obsolete. Usually retrogaming is based upon systems that are obsolete or discontinued. Production of a good may evolve over time, rendering an existing supply chain design obsolete. Like HTTP/2, it does not obsolete previous major versions of the protocol. Some of the Korean sounds represented by these obsolete letters still exist in some dialects. AIX 7.2 was also restructured to remove obsolete components. Historically, it was treated as part of the subfamily Ornithogaloideae of Hyacinthaceae, now obsolete terms. "Emulation" is the replicating of functionality of an obsolete system. Therefore, there is an ongoing need for substitution of obsolete products. Progress has rendered some of the originally defined record-types obsolete. The first-line aircraft that would soon be considered obsolete were the B-18, A-17, and P-36. This usually makes the use of a trunk code obsolete. It had a keyboard with digital encryption, making use of traditional Morse code obsolete.