# Relationship history for MSHA mine 1507383

Current hierarchy: **Marshall Afton → Allen & Marshall Augering Company Inc → Auger No 2**

- 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:** Coastline Coal Corp → Auger No 2; 1974-10-01 to 1992-03-17; source msha-controller-operator-history
- **controller_controls_mine:** Salyers Paul H → Auger No 2; 1974-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Salyers Paul H → Coastline Coal Corp; 1974-10-01 to 1992-03-17; source msha-controller-operator-history
- **controller_controls_mine:** Marshall Afton Et Al → Auger No 2; 1987-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Allen & Marshall Augering Company Inc → Auger No 2; 1992-03-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Marshall Afton Et Al → Allen & Marshall Augering Company Inc; 1992-03-18 to current/open; source msha-controller-operator-history