# Relationship history for MSHA mine 0503872

Current hierarchy: **Myers Jerrold → J & J Gravel Company Inc → Myers 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:** J & J Gravel Company Inc → Myers Pit; 1983-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Myers Jerrold → Myers Pit; 1983-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Myers Jerrold → J & J Gravel Company Inc; 1983-07-01 to current/open; source msha-controller-operator-history