# Relationship history for MSHA mine 0401618

Current hierarchy: **Weins Robert & John Bremer → Corona Dee-Gee Company → Coplin Granite Pit**

- 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:** Corona Dee-Gee Company → Coplin Granite Pit; 1950-01-01 to 1985-04-16; source msha-controller-operator-history
- **controller_controls_mine:** Slaughter Bob → Coplin Granite Pit; 1950-01-01 to 1985-04-16; source msha-controller-operator-history
- **controller_controls_operator:** Slaughter Bob → Corona Dee-Gee Company; 1950-01-01 to 1985-04-16; source msha-controller-operator-history
- **operator_operates_mine:** Corona Dee-Gee Company → Coplin Granite Pit; 1985-04-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Weins Robert & John Bremer → Coplin Granite Pit; 1985-04-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Weins Robert & John Bremer → Corona Dee-Gee Company; 1985-04-17 to current/open; source msha-controller-operator-history