# Relationship history for MSHA mine 1401408

Current hierarchy: **Marvin  Bedigrew → Associated Material & Supply Company Inc → Plant II**

- 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

- **controller_controls_mine:** D L  Stannard → Plant II; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Associated Material & Supply Company Inc → Plant II; 1981-06-01 to 1993-02-24; source msha-controller-operator-history
- **controller_controls_operator:** D L  Stannard → Associated Material & Supply Company Inc; 1981-06-01 to 1993-02-24; source msha-controller-operator-history
- **operator_operates_mine:** Associated Material & Supply Company Inc → Plant II; 1993-02-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Nadine S  Stannard → Plant II; 1993-02-25 to 2025-04-25; source msha-controller-operator-history
- **controller_controls_operator:** Nadine S  Stannard → Associated Material & Supply Company Inc; 1993-02-25 to 2025-04-25; source msha-controller-operator-history
- **controller_controls_mine:** Marvin  Bedigrew → Plant II; 2025-04-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Marvin  Bedigrew → Associated Material & Supply Company Inc; 2025-04-26 to current/open; source msha-controller-operator-history