# Relationship history for MSHA mine 2003452

Current hierarchy: **Kim S  Langlois; John A  Langlois → Langlois and Sons Excavating → 23rd St. Lodenstein Pit**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Langlois and Sons Excavating → 23rd St. Lodenstein Pit; 2011-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John A  Langlois et al → 23rd St. Lodenstein Pit; 2011-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John A  Langlois et al → Langlois and Sons Excavating; 2011-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kim S  Langlois et al → Langlois and Sons Excavating; 2011-08-01 to current/open; source msha-controller-operator-history