# Relationship history for MSHA mine 2500820

Current hierarchy: **G A  Finley → Western Engineering Company Inc → Indianola Pit And Plant No 312**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Western Engineering Company Inc → Indianola Pit And Plant No 312; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** G A  Finley → Indianola Pit And Plant No 312; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** G A  Finley → Western Engineering Company Inc; 1950-01-01 to current/open; source msha-controller-operator-history