# Relationship history for MSHA mine 4503827

Current hierarchy: **Orion Marine Group Inc → Orion Marine Contractors Inc. → Mine #5**

- 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

- **controller_controls_mine:** Orion Marine Group Inc → Mine #5; 2014-10-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John  McAmis → Mine #5; 2018-09-21 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** J. E. McAmis, Inc. → Mine #5; 2021-09-24 to 2026-03-19; source msha-controller-operator-history
- **controller_controls_operator:** John  McAmis → J. E. McAmis, Inc.; 2021-09-24 to 2026-03-19; source msha-controller-operator-history
- **operator_operates_mine:** Orion Marine Contractors Inc. → Mine #5; 2026-03-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Orion Marine Group Inc → Orion Marine Contractors Inc.; 2026-03-20 to current/open; source msha-controller-operator-history