# Relationship history for MSHA mine 1514315

Current hierarchy: **Porter Johnny → Bruin Trucking Inc → Bruin Trucking 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Armm Coal Inc → Bruin Trucking Inc; 1983-11-01 to 1984-08-03; source msha-controller-operator-history
- **controller_controls_mine:** Horizon Natural Resources Incorporated → Bruin Trucking Inc; 1983-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Horizon Natural Resources Incorporated → Armm Coal Inc; 1983-11-01 to 1984-08-03; source msha-controller-operator-history
- **controller_controls_mine:** Porter Johnny → Bruin Trucking Inc; 1984-02-14 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** D & S Contractors Inc → Bruin Trucking Inc; 1984-08-04 to 1987-03-01; source msha-controller-operator-history
- **controller_controls_mine:** Simmons Harold → Bruin Trucking Inc; 1984-08-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Simmons Harold → D & S Contractors Inc; 1984-08-04 to 1987-03-01; source msha-controller-operator-history
- **operator_operates_mine:** Bruin Trucking Inc → Bruin Trucking Inc; 1987-03-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Porter Johnny → Bruin Trucking Inc; 1987-03-02 to current/open; source msha-controller-operator-history