# Relationship history for MSHA mine 1511709

Current hierarchy: **Williamson Larry → Jack Branch Mining 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

- **operator_operates_mine:** Stone Valley Mining Corp → No 1; 1978-11-01 to 1980-02-10; source msha-controller-operator-history
- **controller_controls_mine:** Maxwell Boyce J → No 1; 1978-11-01 to 1980-02-10; source msha-controller-operator-history
- **controller_controls_operator:** Maxwell Boyce J → Stone Valley Mining Corp; 1978-11-01 to 1980-02-10; source msha-controller-operator-history
- **operator_operates_mine:** Jack Branch Mining Company Inc → No 1; 1980-02-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Williamson Larry → No 1; 1980-02-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Williamson Larry → Jack Branch Mining Company Inc; 1980-02-11 to current/open; source msha-controller-operator-history