# Relationship history for MSHA mine 1515000

Current hierarchy: **Starns Raymond → N & R Coal Company Inc → Prep Plant**

- 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:** Gano Coal Company Inc → Prep Plant; 1984-12-01 to 1986-06-12; source msha-controller-operator-history
- **controller_controls_mine:** Maupin Harry → Prep Plant; 1984-12-01 to 1986-06-12; source msha-controller-operator-history
- **controller_controls_operator:** Maupin Harry → Gano Coal Company Inc; 1984-12-01 to 1986-06-12; source msha-controller-operator-history
- **operator_operates_mine:** B & O Recovery Systems Inc → Prep Plant; 1986-06-13 to 1987-07-27; source msha-controller-operator-history
- **controller_controls_mine:** Orrell H G → Prep Plant; 1986-06-13 to 1987-07-27; source msha-controller-operator-history
- **controller_controls_operator:** Orrell H G → B & O Recovery Systems Inc; 1986-06-13 to 1987-07-27; source msha-controller-operator-history
- **operator_operates_mine:** B O Recovery Systems Inc → Prep Plant; 1987-07-28 to 1988-04-20; source msha-controller-operator-history
- **controller_controls_mine:** Bingham Harold → Prep Plant; 1987-07-28 to 1988-04-20; source msha-controller-operator-history
- **controller_controls_operator:** Bingham Harold → B O Recovery Systems Inc; 1987-07-28 to 1988-04-20; source msha-controller-operator-history
- **operator_operates_mine:** Shields Kellioka Coal Company → Prep Plant; 1988-04-21 to 1989-02-06; source msha-controller-operator-history
- **controller_controls_mine:** Roberts Noah & Don Moses → Prep Plant; 1988-04-21 to 1989-02-06; source msha-controller-operator-history
- **controller_controls_operator:** Roberts Noah & Don Moses → Shields Kellioka Coal Company; 1988-04-21 to 1989-02-06; source msha-controller-operator-history
- **operator_operates_mine:** N & R Coal Company Inc → Prep Plant; 1989-02-07 to 1991-03-17; source msha-controller-operator-history
- **controller_controls_mine:** Davis Thomas → Prep Plant; 1989-02-07 to 1991-03-17; source msha-controller-operator-history
- **controller_controls_operator:** Davis Thomas → N & R Coal Company Inc; 1989-02-07 to 1991-03-17; source msha-controller-operator-history
- **operator_operates_mine:** N & R Coal Company Inc → Prep Plant; 1991-03-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Starns Raymond → Prep Plant; 1991-03-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Starns Raymond → N & R Coal Company Inc; 1991-03-18 to current/open; source msha-controller-operator-history