# Relationship history for MSHA mine 1507285

Current hierarchy: **Callihan Jerry → Poor John Coal Company Inc → No 1 Surface**

- 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:** Arnphil Coal Inc → No 1 Surface; 1974-11-01 to 1980-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Bingham Arnold B → No 1 Surface; 1974-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bingham Arnold B → Arnphil Coal Inc; 1974-11-01 to 1980-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Poor John Coal Company Inc → No 1 Surface; 1980-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Callihan Jerry → No 1 Surface; 1980-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Callihan Jerry → Poor John Coal Company Inc; 1980-10-01 to current/open; source msha-controller-operator-history