# Relationship history for MSHA mine 0202392

Current hierarchy: **Peter Kiewit Sons' Inc → Pinal Materials Company Inc → Pinal Materials Co Inc Hulet Road 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

- **controller_controls_mine:** Peter Kiewit Sons' Inc → Pinal Materials Co Inc Hulet Road Pit; 1983-08-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lucky Strike Asphalt Paving → Pinal Materials Co Inc Hulet Road Pit; 1987-10-01 to 1988-03-29; source msha-controller-operator-history
- **controller_controls_mine:** Althoff Weldon J → Pinal Materials Co Inc Hulet Road Pit; 1987-10-01 to 1988-03-29; source msha-controller-operator-history
- **controller_controls_operator:** Althoff Weldon J → Lucky Strike Asphalt Paving; 1987-10-01 to 1988-03-29; source msha-controller-operator-history
- **operator_operates_mine:** Pinal Materials Company Inc → Pinal Materials Co Inc Hulet Road Pit; 1988-03-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Peter Kiewit Sons' Inc → Pinal Materials Company Inc; 1988-03-30 to current/open; source msha-controller-operator-history