# Relationship history for MSHA mine 1516880

Current hierarchy: **Bartley Clinton → Ace Colliery Inc → No 410**

- 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

- **controller_controls_mine:** Bartley Clinton → No 410; 1985-08-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** C C F Inc → No 410; 1990-05-01 to 1990-10-29; source msha-controller-operator-history
- **controller_controls_mine:** Childers Michael & Pat Et Al → No 410; 1990-05-01 to 1990-10-29; source msha-controller-operator-history
- **controller_controls_operator:** Childers Michael & Pat Et Al → C C F Inc; 1990-05-01 to 1990-10-29; source msha-controller-operator-history
- **operator_operates_mine:** Ace Colliery Inc → No 410; 1990-10-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bartley Clinton → Ace Colliery Inc; 1990-10-30 to current/open; source msha-controller-operator-history