# Relationship history for MSHA mine 4403676

Current hierarchy: **Elkins Charles C → Sylvia Ann Coal Company Inc → No 4 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:** Sylvia Ann Coal Company Inc → No 4 Strip; 1974-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Elkins Charles C Et Al → No 4 Strip; 1974-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Elkins Charles C Et Al → Sylvia Ann Coal Company Inc; 1974-01-01 to current/open; source msha-controller-operator-history