Bip39 history https://files.fm/u/2eemhhak2q#design Although it works by using BIP32 approach you can however import BIP39 seeds into Electrum wallet. Also other than BIp32 there is BIP44 version which some wallet use for your era of seeds. It really is simple — if you do not be worried about copyright inheritance, https://list.ly/abregeouoh