When was bip39 introduced https://www.demilked.com/author/gobnettlmz/ Even though it takes advantage of BIP32 system it is possible to however import BIP39 seeds into Electrum wallet. Also aside from BIp32 there is BIP44 Model which some wallet use with the generation of seeds. BitBox02 - A successor for the BitBox sequence, this https://growthbookmarks.com/story20537251/bip39-passphrase-wallet-the-5-second-trick-for-bip39-mnemonic-code-converter-tool-https-www-youtube-com-channel-ucupxfytj0fb78sq55hu6ocw