# Relationship history for MSHA mine 0800013

Current hierarchy: **Oman Jack A → Oman Construction Company Inc → Aripeka Limerock Mine**

- 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:** W L Cobb Construction Company → Aripeka Limerock Mine; 1950-01-01 to 1984-04-12; source msha-controller-operator-history
- **controller_controls_mine:** Roy L  Warren → Aripeka Limerock Mine; 1950-01-01 to 1984-04-12; source msha-controller-operator-history
- **controller_controls_operator:** Roy L  Warren → W L Cobb Construction Company; 1950-01-01 to 1984-04-12; source msha-controller-operator-history
- **operator_operates_mine:** Oman Construction Company Inc → Aripeka Limerock Mine; 1984-04-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Oman Jack A → Aripeka Limerock Mine; 1984-04-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Oman Jack A → Oman Construction Company Inc; 1984-04-13 to current/open; source msha-controller-operator-history