# Relationship history for MSHA mine 3606218

Current hierarchy: **Weaver Richard → R J R Coal & Construction Company Inc → R J R Coal Co Strip**

- 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:** R J R Coal & Construction Company Inc → R J R Coal Co Strip; 1976-09-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Weaver Richard → R J R Coal Co Strip; 1976-09-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Weaver Richard → R J R Coal & Construction Company Inc; 1976-09-14 to current/open; source msha-controller-operator-history