# Relationship history for MSHA mine 3607706

Current hierarchy: **Elwood  Swank → Norwood Mining Company Inc → Bear Valley Bank**

- 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:** Elwood  Swank → Bear Valley Bank; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Longs Refuse Service Inc → Bear Valley Bank; 1985-06-01 to 1986-07-07; source msha-controller-operator-history
- **controller_controls_mine:** Long Helen M → Bear Valley Bank; 1985-06-01 to 1986-07-07; source msha-controller-operator-history
- **controller_controls_operator:** Long Helen M → Longs Refuse Service Inc; 1985-06-01 to 1986-07-07; source msha-controller-operator-history
- **operator_operates_mine:** Norwood Mining Company Inc → Bear Valley Bank; 1986-07-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Elwood  Swank → Norwood Mining Company Inc; 1986-07-08 to current/open; source msha-controller-operator-history