# Relationship history for MSHA mine 1517840

Current hierarchy: **Carver David G → Friendship Energy Inc → Depoy Mine**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Carver David G → Depoy Mine; 1993-05-18 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Friendship Energy Inc → Depoy Mine; 1996-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carver David G → Friendship Energy Inc; 1996-09-01 to current/open; source msha-controller-operator-history