# Relationship history for MSHA mine 4404555

Current hierarchy: **R S C Enterprises Inc → R S C Enterprises Inc → No 1 Dredge**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** R S C Enterprises Inc → No 1 Dredge; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** R S C Enterprises Inc → No 1 Dredge; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** R S C Enterprises Inc → R S C Enterprises Inc; 1950-01-01 to current/open; source msha-controller-operator-history