# Relationship history for MSHA mine 3002282

Current hierarchy: **Town Of Berlin-Ny → Town Of Berlin → Center Berlin Gravel**

- 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:** Nelson W Sweener → Center Berlin Gravel; 1950-01-01 to 1979-03-11; source msha-controller-operator-history
- **controller_controls_mine:** Sweener Nelson W → Center Berlin Gravel; 1950-01-01 to 1979-03-11; source msha-controller-operator-history
- **controller_controls_operator:** Sweener Nelson W → Nelson W Sweener; 1950-01-01 to 1979-03-11; source msha-controller-operator-history
- **operator_operates_mine:** Town Of Berlin → Center Berlin Gravel; 1979-03-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Town Of Berlin-Ny → Center Berlin Gravel; 1979-03-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Town Of Berlin-Ny → Town Of Berlin; 1979-03-12 to current/open; source msha-controller-operator-history