# Relationship history for MSHA mine 3002413

Current hierarchy: **Robinson Earl P → Lowman Sand & Gravel → Lowman 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:** Narde Paving Company Inc → Lowman Pit; 1979-01-01 to 1987-05-05; source msha-controller-operator-history
- **controller_controls_mine:** Donald A Narde → Lowman Pit; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald A Narde → Narde Paving Company Inc; 1979-01-01 to 1987-05-05; source msha-controller-operator-history
- **operator_operates_mine:** Elmira Sand & Gravel → Lowman Pit; 1987-05-06 to 1987-08-05; source msha-controller-operator-history
- **controller_controls_mine:** Bushey Barbara J → Lowman Pit; 1987-05-06 to 1987-08-05; source msha-controller-operator-history
- **controller_controls_operator:** Bushey Barbara J → Elmira Sand & Gravel; 1987-05-06 to 1987-08-05; source msha-controller-operator-history
- **operator_operates_mine:** Lowman Sand & Gravel → Lowman Pit; 1987-08-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robinson Earl P → Lowman Pit; 1987-08-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robinson Earl P → Lowman Sand & Gravel; 1987-08-06 to current/open; source msha-controller-operator-history