# Relationship history for MSHA mine 0401667

Current hierarchy: **Daniel N  Smith; Stanley C  Young → Chatfield Ranch Llc → SPANISH CREEK SAND & GRAVEL**

- 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:** Spanish Creek Aggregates → SPANISH CREEK SAND & GRAVEL; 1950-01-01 to 1999-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Hale  Charlton  et al → SPANISH CREEK SAND & GRAVEL; 1950-01-01 to 1999-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Hale  Charlton  et al → Spanish Creek Aggregates; 1950-01-01 to 1999-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Chatfield Ranch Llc → SPANISH CREEK SAND & GRAVEL; 1999-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stanley C  Young  et al → SPANISH CREEK SAND & GRAVEL; 1999-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stanley C  Young  et al → Chatfield Ranch Llc; 1999-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daniel N  Smith  et al → Chatfield Ranch Llc; 1999-07-01 to current/open; source msha-controller-operator-history