# Relationship history for MSHA mine 0202537

Current hierarchy: **C J Langenfelder & Son Inc → Fnf Mining → Eq#71-06 Lj 1316 Crushing Plant S/N 42do**

- 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

- **controller_controls_mine:** C J Langenfelder & Son Inc → Eq#71-06 Lj 1316 Crushing Plant S/N 42do; 1987-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Fnf Mining → Eq#71-06 Lj 1316 Crushing Plant S/N 42do; 1990-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** C J Langenfelder & Son Inc → Fnf Mining; 1990-10-01 to current/open; source msha-controller-operator-history