# Relationship history for MSHA mine 1507779

Current hierarchy: **Gibson James A & James A Allen → Gibson & Allen Coal Company → No 1 Strip**

- 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:** Gibson & Allen Coal Company → No 1 Strip; 1974-12-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gibson James A & James A Allen → No 1 Strip; 1974-12-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gibson James A & James A Allen → Gibson & Allen Coal Company; 1974-12-05 to current/open; source msha-controller-operator-history