# Relationship history for MSHA mine 3601818

Current hierarchy: **John Robert Rothermel → R S & W Coal Co Inc → R S & W Drift**

- 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:** Coxe Coal Company → R S & W Drift; 1950-01-01 to 1980-05-01; source msha-controller-operator-history
- **controller_controls_mine:** Richard  Zimmerman et al → R S & W Drift; 1950-01-01 to 1980-05-01; source msha-controller-operator-history
- **controller_controls_operator:** Richard  Zimmerman et al → Coxe Coal Company; 1950-01-01 to 1980-05-01; source msha-controller-operator-history
- **operator_operates_mine:** Coxe Coal Company → R S & W Drift; 1980-05-02 to 1984-11-07; source msha-controller-operator-history
- **controller_controls_mine:** Terry  Swartzlander et al → R S & W Drift; 1980-05-02 to 1984-11-07; source msha-controller-operator-history
- **controller_controls_operator:** Terry  Swartzlander et al → Coxe Coal Company; 1980-05-02 to 1984-11-07; source msha-controller-operator-history
- **operator_operates_mine:** R S & W Coal Co Inc → R S & W Drift; 1984-11-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Randy C  Rothermel et al → R S & W Drift; 1984-11-08 to 2015-01-15; source msha-controller-operator-history
- **controller_controls_operator:** Randy C  Rothermel et al → R S & W Coal Co Inc; 1984-11-08 to 2015-01-15; source msha-controller-operator-history
- **controller_controls_mine:** John  Rothermel et al → R S & W Drift; 2015-01-16 to 2021-01-31; source msha-controller-operator-history
- **controller_controls_operator:** John  Rothermel et al → R S & W Coal Co Inc; 2015-01-16 to 2021-01-31; source msha-controller-operator-history
- **controller_controls_operator:** Frank  Krammes et al → R S & W Coal Co Inc; 2015-01-16 to 2021-01-31; source msha-controller-operator-history
- **controller_controls_mine:** John R  Rothermel et al → R S & W Drift; 2021-02-01 to 2023-07-25; source msha-controller-operator-history
- **controller_controls_operator:** John R  Rothermel et al → R S & W Coal Co Inc; 2021-02-01 to 2023-07-25; source msha-controller-operator-history
- **controller_controls_operator:** Travis  Rothermel et al → R S & W Coal Co Inc; 2021-02-01 to 2023-07-25; source msha-controller-operator-history
- **controller_controls_mine:** John Robert Rothermel → R S & W Drift; 2023-07-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John Robert Rothermel → R S & W Coal Co Inc; 2023-07-26 to current/open; source msha-controller-operator-history