# Relationship history for MSHA mine 3608402

Current hierarchy: **Taylor Robert F → Robert F. Taylor → Reesman Mine**

- 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:** Greg Coal Company → Reesman Mine; 1993-04-01 to 1995-08-16; source msha-controller-operator-history
- **controller_controls_mine:** Douglas Greg L → Reesman Mine; 1993-04-01 to 1995-08-16; source msha-controller-operator-history
- **controller_controls_operator:** Douglas Greg L → Greg Coal Company; 1993-04-01 to 1995-08-16; source msha-controller-operator-history
- **operator_operates_mine:** Robert F Taylor → Reesman Mine; 1995-08-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Taylor Robert F → Reesman Mine; 1995-08-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Taylor Robert F → Robert F Taylor; 1995-08-17 to current/open; source msha-controller-operator-history