# Relationship history for MSHA mine 3400818

Current hierarchy: **Rogers Edward & Kenneth Reading → Pioneer Rock & Chat Inc → PIONEER**

- 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:** Arrowhead Asphalt Company → PIONEER; 1950-01-01 to 1984-03-25; source msha-controller-operator-history
- **controller_controls_mine:** Sharpensteen Jack Jr → PIONEER; 1950-01-01 to 1984-03-25; source msha-controller-operator-history
- **controller_controls_operator:** Sharpensteen Jack Jr → Arrowhead Asphalt Company; 1950-01-01 to 1984-03-25; source msha-controller-operator-history
- **operator_operates_mine:** Cherokee Materials Company → PIONEER; 1984-03-26 to 1985-09-16; source msha-controller-operator-history
- **controller_controls_mine:** Van Sandt Glenn → PIONEER; 1984-03-26 to 1985-09-16; source msha-controller-operator-history
- **controller_controls_operator:** Van Sandt Glenn → Cherokee Materials Company; 1984-03-26 to 1985-09-16; source msha-controller-operator-history
- **operator_operates_mine:** Pioneer Rock & Chat Inc → PIONEER; 1985-09-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rogers Edward & Kenneth Reading → PIONEER; 1985-09-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rogers Edward & Kenneth Reading → Pioneer Rock & Chat Inc; 1985-09-17 to current/open; source msha-controller-operator-history