# Relationship history for MSHA mine 1508363

Current hierarchy: **Marra Angelo R → Coalglo Corp → 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:** Coalglo Corp → No 1 Surface; 1975-05-01 to 1976-03-22; source msha-controller-operator-history
- **controller_controls_mine:** Brock C Wade → No 1 Surface; 1975-05-01 to 1976-03-22; source msha-controller-operator-history
- **controller_controls_operator:** Brock C Wade → Coalglo Corp; 1975-05-01 to 1976-03-22; source msha-controller-operator-history
- **operator_operates_mine:** Coalglo Corp → No 1 Surface; 1976-03-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Marra Angelo R → No 1 Surface; 1976-03-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Marra Angelo R → Coalglo Corp; 1976-03-23 to current/open; source msha-controller-operator-history