# Relationship history for MSHA mine 2101703

Current hierarchy: **Plehal Jack D → Plehal Blacktopping Inc → Plehal 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

- **operator_operates_mine:** River Warren Aggregates Inc → Plehal Pit; 1950-01-01 to 1979-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Varner Roy S → Plehal Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Varner Roy S → River Warren Aggregates Inc; 1950-01-01 to 1979-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Plehal Blacktopping Inc → Plehal Pit; 1979-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Plehal Jack D → Plehal Pit; 1979-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Plehal Jack D → Plehal Blacktopping Inc; 1979-10-01 to current/open; source msha-controller-operator-history