# Relationship history for MSHA mine 0301373

Current hierarchy: **Mack  McAlister → Pryor Mountain Quarry Inc → Pryor Mountain Quarry Inc**

- 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:** Hellcat Heights Inc → Pryor Mountain Quarry Inc; 1950-01-01 to 1994-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Mc Whorter O C → Pryor Mountain Quarry Inc; 1950-01-01 to 1994-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Mc Whorter O C → Hellcat Heights Inc; 1950-01-01 to 1994-10-31; source msha-controller-operator-history
- **operator_operates_mine:** F & B Construction Company Inc → Pryor Mountain Quarry Inc; 1994-11-01 to 2000-03-07; source msha-controller-operator-history
- **controller_controls_mine:** Fortenberry T L → Pryor Mountain Quarry Inc; 1994-11-01 to 2000-03-07; source msha-controller-operator-history
- **controller_controls_operator:** Fortenberry T L → F & B Construction Company Inc; 1994-11-01 to 2000-03-07; source msha-controller-operator-history
- **operator_operates_mine:** Pryor Mountain Quarry Inc → Pryor Mountain Quarry Inc; 2000-03-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mack  McAlister → Pryor Mountain Quarry Inc; 2000-03-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mack  McAlister → Pryor Mountain Quarry Inc; 2000-03-08 to current/open; source msha-controller-operator-history