# Relationship history for MSHA mine 3602995

Current hierarchy: **Wagner John L → Wagner Coal Company → Wagner Strip**

- 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:** Mauersberg Coal Company → Wagner Strip; 1950-01-01 to 1979-01-25; source msha-controller-operator-history
- **controller_controls_mine:** Mauersberg Richard-Kenneth-Gerald & Robert → Wagner Strip; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mauersberg Richard-Kenneth-Gerald & Robert → Mauersberg Coal Company; 1950-01-01 to 1979-01-25; source msha-controller-operator-history
- **operator_operates_mine:** Wagner Coal Company → Wagner Strip; 1979-01-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wagner John L → Wagner Strip; 1979-01-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wagner John L → Wagner Coal Company; 1979-01-26 to current/open; source msha-controller-operator-history