# Relationship history for MSHA mine 2700467

Current hierarchy: **Teresa J  Hardwick → D.H. Hardwick + Sons, Inc. → D.H. Hardwick + Sons, Inc.**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** D.H. Hardwick + Sons, Inc. → D.H. Hardwick + Sons, Inc.; 2012-11-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Teresa J  Hardwick et al → D.H. Hardwick + Sons, Inc.; 2012-11-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Teresa J  Hardwick et al → D.H. Hardwick + Sons, Inc.; 2012-11-26 to current/open; source msha-controller-operator-history