# Relationship history for MSHA mine 3303863

Current hierarchy: **Marty D  Coates → M J Coates Construction Company → Coates 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** M J Coates Construction Company → Coates Gravel Pit; 1981-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Martin J  Coates → Coates Gravel Pit; 1981-05-01 to 2024-07-23; source msha-controller-operator-history
- **controller_controls_operator:** Martin J  Coates → M J Coates Construction Company; 1981-05-01 to 2024-07-23; source msha-controller-operator-history
- **controller_controls_mine:** Marty D  Coates → Coates Gravel Pit; 2024-07-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Marty D  Coates → M J Coates Construction Company; 2024-07-24 to current/open; source msha-controller-operator-history