# Relationship history for MSHA mine 1514142

Current hierarchy: **Porter Johnny → Bruin Trucking Inc → Mine No 1**

- 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:** Jim Lewis Mining Inc → Mine No 1; 1983-07-01 to 1984-02-13; source msha-controller-operator-history
- **controller_controls_mine:** Lewis James E → Mine No 1; 1983-07-01 to 1984-02-13; source msha-controller-operator-history
- **controller_controls_operator:** Lewis James E → Jim Lewis Mining Inc; 1983-07-01 to 1984-02-13; source msha-controller-operator-history
- **operator_operates_mine:** Bruin Trucking Inc → Mine No 1; 1984-02-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Porter Johnny → Mine No 1; 1984-02-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Porter Johnny → Bruin Trucking Inc; 1984-02-14 to current/open; source msha-controller-operator-history