# Relationship history for MSHA mine 3900381

Current hierarchy: **Hoffman Maurice → Strawberry Hill Mining Company Inc → Strawberry Hill 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:** Strawberry Hill Mining Company Inc → Strawberry Hill Mine; 1950-01-01 to 1984-06-26; source msha-controller-operator-history
- **controller_controls_mine:** Hoffman Maurice → Strawberry Hill Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hoffman Maurice → Strawberry Hill Mining Company Inc; 1950-01-01 to 1984-06-26; source msha-controller-operator-history
- **operator_operates_mine:** Minerals International Company → Strawberry Hill Mine; 1984-06-27 to 1986-07-28; source msha-controller-operator-history
- **controller_controls_mine:** Graham Gary J → Strawberry Hill Mine; 1984-06-27 to 1986-07-28; source msha-controller-operator-history
- **controller_controls_operator:** Graham Gary J → Minerals International Company; 1984-06-27 to 1986-07-28; source msha-controller-operator-history
- **operator_operates_mine:** Strawberry Hill Mining Company Inc → Strawberry Hill Mine; 1986-07-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hoffman Maurice → Strawberry Hill Mining Company Inc; 1986-07-29 to current/open; source msha-controller-operator-history