# Relationship history for MSHA mine 1511800

Current hierarchy: **Middleton Donald → M & D 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Vandagriff & Newsome Coal Company → No 1 Mine; 1979-03-01 to 1981-03-26; source msha-controller-operator-history
- **controller_controls_mine:** Newsome Ollie Et Al → No 1 Mine; 1979-03-01 to 1981-03-26; source msha-controller-operator-history
- **controller_controls_operator:** Newsome Ollie Et Al → Vandagriff & Newsome Coal Company; 1979-03-01 to 1981-03-26; source msha-controller-operator-history
- **operator_operates_mine:** M & D Coal Company → No 1 Mine; 1981-03-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Middleton Donald → No 1 Mine; 1981-03-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Middleton Donald → M & D Coal Company; 1981-03-27 to current/open; source msha-controller-operator-history