# Relationship history for MSHA mine 4608304

Current hierarchy: **Richard G  Preservati II → Mid-Vol Leasing Inc → Roadfork #6**

- 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:** Richard G  Preservati II → Roadfork #6; 1992-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mid-Vol Leasing Inc → Roadfork #6; 1993-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard G  Preservati II → Mid-Vol Leasing Inc; 1993-05-01 to current/open; source msha-controller-operator-history