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|Number of cells||21|
|Output orientation||Unturned, flipped|
|Recovery time||63 ticks|
|Discovered by||Paul Callahan|
|Year of discovery||1997|
HFx58B is a common Herschel to B-heptomino converter, used as the first stage of F117 and many other Herschel conduits. There are two common variants, both shown in the pattern in the infobox, with "ghost" B-heptominoes and "ghost" BFx59H's marking the output locations. By adding a bouncer, an HFx78H can be made as in the infobox.