# Relationship history for MSHA mine 1300768

Current hierarchy: **Stanley  Flewelling; Marvin  Flewelling → Flewelling Sand & Gravel → FLEWELLING 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Flewelling Gravel Company → FLEWELLING SAND & GRAVEL; 1950-01-01 to 1983-12-01; source msha-controller-operator-history
- **controller_controls_mine:** Tom  Flewelling → FLEWELLING SAND & GRAVEL; 1950-01-01 to 1983-12-01; source msha-controller-operator-history
- **controller_controls_operator:** Tom  Flewelling → Flewelling Gravel Company; 1950-01-01 to 1983-12-01; source msha-controller-operator-history
- **operator_operates_mine:** Flewelling Sand & Gravel → FLEWELLING SAND & GRAVEL; 1983-12-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stanley  Flewelling  et al → FLEWELLING SAND & GRAVEL; 1983-12-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stanley  Flewelling  et al → Flewelling Sand & Gravel; 1983-12-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Marvin  Flewelling  et al → Flewelling Sand & Gravel; 1983-12-02 to current/open; source msha-controller-operator-history