# Relationship history for MSHA mine 1512166

Current hierarchy: **Wetterich John J → Mountain Energy Resources Inc → Tipple No 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

- **operator_operates_mine:** Mountain Energy Resources Inc → Tipple No 1; 1979-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wetterich John J → Tipple No 1; 1979-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wetterich John J → Mountain Energy Resources Inc; 1979-12-01 to current/open; source msha-controller-operator-history