# Relationship history for MSHA mine 1517823

Current hierarchy: **Meeks Alvin E & Edgar Allen King → K & M Coal Company Inc → #18**

- 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:** Meeks Alvin E & Edgar Allen King → #18; 1977-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** K & M Coal Company Inc → #18; 1996-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Meeks Alvin E & Edgar Allen King → K & M Coal Company Inc; 1996-08-01 to current/open; source msha-controller-operator-history