# Relationship history for MSHA mine 1300171

Current hierarchy: **B W  Carpenter → Alpha Crushed Stone Inc → Hunts 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 → Hunts Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** B W  Carpenter  et al → Hunts 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 current/open; source msha-controller-operator-history