# Relationship history for MSHA mine 2200802

Current hierarchy: **Bennis  Walters → Walters Construction Co., Inc. → Walters Development Gravel Pit**

- 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:** Bennis  Walters → Walters Development Gravel Pit; 1980-04-17 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Walters Construction Co., Inc. → Walters Development Gravel Pit; 2010-11-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bennis  Walters → Walters Construction Co., Inc.; 2010-11-17 to current/open; source msha-controller-operator-history