# Relationship history for MSHA mine 2003200

Current hierarchy: **Kenneth M Myera → Myers Gravel Inc → BLUE ROAD 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Kenneth M Myera → BLUE ROAD PIT; 1981-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Myers Gravel Inc → BLUE ROAD PIT; 2001-05-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kenneth M Myera → Myers Gravel Inc; 2001-05-08 to current/open; source msha-controller-operator-history