# WIRTH Group x Hitachi Zosen (Tunnel Bore Extender) revision history

Append-only Arc G field-change log. Forward-only honesty: events accrue from Arc G adoption.

Partnership: [WIRTH Group x Hitachi Zosen (Tunnel Bore Extender)](/partnerships/wirth-group-x-hitachi-zosen-tunnel-bore-extender.md)

## Recorded posture

- First recorded event: 2026-08-23
- Last material change: 2026-08-23
- Material event count: 1
- Editorial event count: 0

## Forward-only note

Arc G is forward-only. The event log accrues from the Arc G adoption point. Fields with no events post-baseline equal the current cached value and are not independently verified at any prior date.

_Canonical URL: /partnerships/wirth-group-x-hitachi-zosen-tunnel-bore-extender/history. REST: /v1/partnerships/2fd5dd88-36ba-4e1a-8f9d-e53a7f161206/history. HTML: [/partnerships/wirth-group-x-hitachi-zosen-tunnel-bore-extender/history](/partnerships/wirth-group-x-hitachi-zosen-tunnel-bore-extender/history)._