# Relationship history for MSHA mine 4605554

Current hierarchy: **Hickson Calvin W → G & E Coal Company Inc → No 7**

- 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:** George  Newsom → No 7; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** G & E Coal Company → No 7; 1977-06-01 to 1978-03-29; source msha-controller-operator-history
- **controller_controls_operator:** George  Newsom → G & E Coal Company; 1977-06-01 to 1978-03-29; source msha-controller-operator-history
- **operator_operates_mine:** G & E Coal Company Inc → No 7; 1978-03-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hickson Calvin W → No 7; 1978-03-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hickson Calvin W → G & E Coal Company Inc; 1978-03-30 to current/open; source msha-controller-operator-history