# Relationship history for MSHA mine 1400072

Current hierarchy: **Patrick  Kerr → Heritage Stone Group → BRONSON 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:** Bandera Stone Inc → BRONSON QUARRY; 2000-03-01 to 2026-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Donald K  Pemberton → BRONSON QUARRY; 2000-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald K  Pemberton → Bandera Stone Inc; 2000-03-01 to 2026-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Heritage Stone Group → BRONSON QUARRY; 2026-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Patrick  Kerr → BRONSON QUARRY; 2026-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Patrick  Kerr → Heritage Stone Group; 2026-04-01 to current/open; source msha-controller-operator-history