# Relationship history for MSHA mine 3304544

Current hierarchy: **David B Renner → Orville Trucking → Orrville Trucking**

- 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:** Courtney Enterprises Inc → Orrville Trucking; 2005-04-25 to 2007-09-06; source msha-controller-operator-history
- **controller_controls_mine:** Dawn L  Greer et al → Orrville Trucking; 2005-04-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dawn L  Greer et al → Courtney Enterprises Inc; 2005-04-25 to 2007-09-06; source msha-controller-operator-history
- **controller_controls_operator:** Don A  Greer et al → Courtney Enterprises Inc; 2005-04-25 to 2007-09-06; source msha-controller-operator-history
- **operator_operates_mine:** P & R Materials LLC → Orrville Trucking; 2007-09-07 to 2008-09-28; source msha-controller-operator-history
- **controller_controls_mine:** Stephen C  Forker → Orrville Trucking; 2007-09-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stephen C  Forker → P & R Materials LLC; 2007-09-07 to 2008-09-28; source msha-controller-operator-history
- **operator_operates_mine:** Orville Trucking → Orrville Trucking; 2008-09-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David B Renner → Orrville Trucking; 2008-09-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David B Renner → Orville Trucking; 2008-09-29 to current/open; source msha-controller-operator-history