# Relationship history for MSHA mine 4607120

Current hierarchy: **Salyers Herman → Spring Hollow Mining Inc → Spring Hollow #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:** Iron Eagle Coal Corp → Spring Hollow #1 Mine; 1986-05-01 to 1987-04-02; source msha-controller-operator-history
- **controller_controls_mine:** Jeter R Ben → Spring Hollow #1 Mine; 1986-05-01 to 1987-04-02; source msha-controller-operator-history
- **controller_controls_operator:** Jeter R Ben → Iron Eagle Coal Corp; 1986-05-01 to 1987-04-02; source msha-controller-operator-history
- **operator_operates_mine:** Spring Hollow Mining Inc → Spring Hollow #1 Mine; 1987-04-03 to 1989-01-01; source msha-controller-operator-history
- **controller_controls_mine:** Salyers Don → Spring Hollow #1 Mine; 1987-04-03 to 1989-01-01; source msha-controller-operator-history
- **controller_controls_operator:** Salyers Don → Spring Hollow Mining Inc; 1987-04-03 to 1989-01-01; source msha-controller-operator-history
- **operator_operates_mine:** Spring Hollow Mining Inc → Spring Hollow #1 Mine; 1989-01-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Salyers Herman → Spring Hollow #1 Mine; 1989-01-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Salyers Herman → Spring Hollow Mining Inc; 1989-01-02 to current/open; source msha-controller-operator-history