# Relationship history for MSHA mine 4103029

Current hierarchy: **Sanders James A & Kenneth L Dillard → Navarro Sand & Gravel → Navarro 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:** Navarro Sand & Gravel → Navarro Pit; 1980-08-01 to 1985-10-23; source msha-controller-operator-history
- **controller_controls_mine:** Rutherford J S Jr → Navarro Pit; 1980-08-01 to 1985-10-23; source msha-controller-operator-history
- **controller_controls_operator:** Rutherford J S Jr → Navarro Sand & Gravel; 1980-08-01 to 1985-10-23; source msha-controller-operator-history
- **operator_operates_mine:** Navarro Sand & Gravel → Navarro Pit; 1985-10-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sanders James A & Kenneth L Dillard → Navarro Pit; 1985-10-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sanders James A & Kenneth L Dillard → Navarro Sand & Gravel; 1985-10-24 to current/open; source msha-controller-operator-history