# Relationship history for MSHA mine 4607978

Current hierarchy: **Spencer William → Beverly Leasing Inc → Mine #3**

- 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:** Beverly Leasing Inc → Mine #3; 1990-12-01 to 1992-03-24; source msha-controller-operator-history
- **controller_controls_mine:** Garretson Roy → Mine #3; 1990-12-01 to 1992-03-24; source msha-controller-operator-history
- **controller_controls_operator:** Garretson Roy → Beverly Leasing Inc; 1990-12-01 to 1992-03-24; source msha-controller-operator-history
- **operator_operates_mine:** Beverly Leasing Inc → Mine #3; 1992-03-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Spencer William Et Al → Mine #3; 1992-03-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Spencer William Et Al → Beverly Leasing Inc; 1992-03-25 to current/open; source msha-controller-operator-history