# Relationship history for MSHA mine 4605478

Current hierarchy: **Webb John & Jack Adkins → Alley Branch Coal Company Inc → No 1**

- 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:** Ronald G  Goff → No 1; 1974-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Goff Brothers Coal Company Inc → No 1; 1977-04-01 to 1978-03-14; source msha-controller-operator-history
- **controller_controls_operator:** Ronald G  Goff → Goff Brothers Coal Company Inc; 1977-04-01 to 1978-03-14; source msha-controller-operator-history
- **operator_operates_mine:** Alley Branch Coal Company Inc → No 1; 1978-03-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Webb John & Jack Adkins → No 1; 1978-03-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Webb John & Jack Adkins → Alley Branch Coal Company Inc; 1978-03-15 to current/open; source msha-controller-operator-history