# Relationship history for MSHA mine 1202227

Current hierarchy: **T Dean  Barnes → Walton Quarry Inc → WALTON QUARRIES, 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:** Walton Quarry Inc → WALTON QUARRIES, INC.; 1998-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** T Dean  Barnes et al → WALTON QUARRIES, INC.; 1998-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** T Dean  Barnes et al → Walton Quarry Inc; 1998-02-01 to current/open; source msha-controller-operator-history