# Relationship history for MSHA mine 1101220

Current hierarchy: **David K  Stark → Stark Materials Inc → HEYWORTH GRAVEL 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:** Urban Sand & Gravel Company Inc → HEYWORTH GRAVEL PIT; 1950-01-01 to 1996-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Charles H  Odle → HEYWORTH GRAVEL PIT; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles H  Odle → Urban Sand & Gravel Company Inc; 1950-01-01 to 1996-12-31; source msha-controller-operator-history
- **controller_controls_mine:** David K  Stark → HEYWORTH GRAVEL PIT; 1989-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Stark Materials Inc → HEYWORTH GRAVEL PIT; 1997-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David K  Stark → Stark Materials Inc; 1997-01-01 to current/open; source msha-controller-operator-history