# Relationship history for MSHA mine 1507208

Current hierarchy: **Webb Elmer → Webb Coal Company Inc → No 10-C 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Webb Coal Company Inc → No 10-C Mine; 1974-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Webb Elmer → No 10-C Mine; 1974-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Webb Elmer → Webb Coal Company Inc; 1974-01-01 to current/open; source msha-controller-operator-history