Bip39 history https://josuejnub341.image-perth.org/the-future-of-copyright-security-why-bip39-issues-for-every-person Although it employs BIP32 system you are able to continue to import BIP39 seeds into Electrum wallet. Also in addition to BIp32 there is BIP44 Model which some wallet use for that era of seeds. BIP32 and BIP44 operate with each other so as to add versatility, https://zenwriting.net/keenanctdp/how-to-create-a-bip39-seed-a-step-by-step-guide