# Relationship history for MSHA mine 1300179

Current hierarchy: **Manaco Corporation → Wendling Quarries Inc → Plower Quarry**

- 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:** Alpha Crushed Stone Inc → Plower Quarry; 1950-01-01 to 1987-02-28; source msha-controller-operator-history
- **controller_controls_mine:** B W  Carpenter  et al → Plower Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** B W  Carpenter  et al → Alpha Crushed Stone Inc; 1950-01-01 to 1987-02-28; source msha-controller-operator-history
- **operator_operates_mine:** Wendling Quarries Inc → Plower Quarry; 1987-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Manaco Corporation → Plower Quarry; 1987-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Manaco Corporation → Wendling Quarries Inc; 1987-03-01 to current/open; source msha-controller-operator-history