# Relationship history for MSHA mine 0600201

Current hierarchy: **Robert D  Beard → Beard Sand & Gravel Company Inc → ORONOQUE PIT AND MILL**

- 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

- **operator_operates_mine:** Beard Sand & Gravel Company Inc → ORONOQUE PIT AND MILL; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert D  Beard → ORONOQUE PIT AND MILL; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert D  Beard → Beard Sand & Gravel Company Inc; 1950-01-01 to current/open; source msha-controller-operator-history