# Relationship history for MSHA mine 1517129

Current hierarchy: **Kenneth L  Farley → Big Branch Mining Inc → Mine #2**

- 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:** Kenneth L  Farley et al → Mine #2; 1990-08-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Big Branch Mining Inc → Mine #2; 1991-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kenneth L  Farley et al → Big Branch Mining Inc; 1991-09-01 to current/open; source msha-controller-operator-history