# Relationship history for MSHA mine 4603754

Current hierarchy: **Bramer Dick → Nada Coal Company → No 1-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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Sinsel Coal Company → No 1-Mine; 1950-01-01 to 1974-03-01; source msha-controller-operator-history
- **controller_controls_mine:** Sinsel Coal Company → No 1-Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sinsel Coal Company → Sinsel Coal Company; 1950-01-01 to 1974-03-01; source msha-controller-operator-history
- **operator_operates_mine:** Nada Coal Company → No 1-Mine; 1974-03-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bramer Dick → No 1-Mine; 1974-03-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bramer Dick → Nada Coal Company; 1974-03-02 to current/open; source msha-controller-operator-history