# Relationship history for MSHA mine 3402195

Current hierarchy: **William Andy Nance; Josh L Walls → Stoneworx of Oklahoma → Calhoun pit 1**

- 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

- **controller_controls_mine:** William Andy Nance et al → Calhoun pit 1; 2019-01-07 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Stoneworx of Oklahoma → Calhoun pit 1; 2019-07-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William Andy Nance et al → Stoneworx of Oklahoma; 2019-07-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Josh L Walls et al → Stoneworx of Oklahoma; 2019-07-31 to current/open; source msha-controller-operator-history