# Relationship history for MSHA mine 4402219

Current hierarchy: **Kitson Robert K → Blue Ridge Talc Company Inc → King Ramsey**

- 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:** Blue Ridge Talc Company Inc → King Ramsey; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kitson Robert K → King Ramsey; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kitson Robert K → Blue Ridge Talc Company Inc; 1950-01-01 to current/open; source msha-controller-operator-history