# Relationship history for MSHA mine 1301731

Current hierarchy: **Lindsey R  Falk → L R Falk Construction Company → Stevens Quarry**

- 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:** L R Falk Construction Company → Stevens Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lindsey R  Falk et al → Stevens Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lindsey R  Falk et al → L R Falk Construction Company; 1950-01-01 to current/open; source msha-controller-operator-history