# Relationship history for MSHA mine 4003028

Current hierarchy: **Rodney  Sanders → Sanders Enterprises Coal Company → No 1**

- 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:** T J Mining Inc → No 1; 1990-02-01 to 1990-09-03; source msha-controller-operator-history
- **controller_controls_mine:** John H  Parton → No 1; 1990-02-01 to 1997-01-01; source msha-controller-operator-history
- **controller_controls_operator:** John H  Parton → T J Mining Inc; 1990-02-01 to 1990-09-03; source msha-controller-operator-history
- **controller_controls_mine:** Marcum Zora → No 1; 1990-09-01 to 1991-11-18; source msha-controller-operator-history
- **operator_operates_mine:** Sanders Enterprises Coal Company → No 1; 1990-09-04 to 1990-11-08; source msha-controller-operator-history
- **controller_controls_mine:** Rodney  Sanders → No 1; 1990-09-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rodney  Sanders → Sanders Enterprises Coal Company; 1990-09-04 to 1990-11-08; source msha-controller-operator-history
- **operator_operates_mine:** Z Mining Inc → No 1; 1990-11-09 to 1991-11-18; source msha-controller-operator-history
- **controller_controls_operator:** Marcum Zora → Z Mining Inc; 1990-11-09 to 1991-11-18; source msha-controller-operator-history
- **operator_operates_mine:** Sanders Enterprises Coal Company → No 1; 1991-11-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rodney  Sanders → Sanders Enterprises Coal Company; 1991-11-19 to current/open; source msha-controller-operator-history