# Relationship history for MSHA mine 1000327

Current hierarchy: **Wood Charles W → Nampa Paving & Asphalt Company → Nampa Rock & Sand 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Idaho Concrete Company Inc → Nampa Rock & Sand Pit; 1950-01-01 to 1986-02-12; source msha-controller-operator-history
- **controller_controls_mine:** Robert L  Rice et al → Nampa Rock & Sand Pit; 1950-01-01 to 2000-03-26; source msha-controller-operator-history
- **controller_controls_operator:** Robert L  Rice et al → Idaho Concrete Company Inc; 1950-01-01 to 1986-02-12; source msha-controller-operator-history
- **operator_operates_mine:** Nampa Paving & Asphalt Company → Nampa Rock & Sand Pit; 1986-02-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wood Charles W Et Al → Nampa Rock & Sand Pit; 1986-02-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wood Charles W Et Al → Nampa Paving & Asphalt Company; 1986-02-13 to current/open; source msha-controller-operator-history