# Relationship history for MSHA mine 4600009

Current hierarchy: **Criss Vernon → Century Limestone Inc → Century Limestone**

- 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:** Elkins Limestone Company Inc → Century Limestone; 1950-01-01 to 1984-03-12; source msha-controller-operator-history
- **controller_controls_mine:** Wolfe A J → Century Limestone; 1950-01-01 to 1984-03-12; source msha-controller-operator-history
- **controller_controls_operator:** Wolfe A J → Elkins Limestone Company Inc; 1950-01-01 to 1984-03-12; source msha-controller-operator-history
- **controller_controls_mine:** Criss Vernon → Century Limestone; 1984-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Century Limestone Inc → Century Limestone; 1984-03-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Criss Vernon → Century Limestone Inc; 1984-03-13 to current/open; source msha-controller-operator-history