# Relationship history for MSHA mine 3607681

Current hierarchy: **Sheldon  Derck → Jordan L Coal Company → Jordan #1 Slope**

- 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:** Robert E  Shuey → Jordan #1 Slope; 1975-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** North Mountain Coal Inc → Jordan #1 Slope; 1985-04-01 to 1987-06-07; source msha-controller-operator-history
- **controller_controls_operator:** Robert E  Shuey → North Mountain Coal Inc; 1985-04-01 to 1987-06-07; source msha-controller-operator-history
- **operator_operates_mine:** North Mountain Coal → Jordan #1 Slope; 1987-06-08 to 1994-04-18; source msha-controller-operator-history
- **controller_controls_mine:** Donald R  Rebuck → Jordan #1 Slope; 1987-06-08 to 1994-04-18; source msha-controller-operator-history
- **controller_controls_operator:** Donald R  Rebuck → North Mountain Coal; 1987-06-08 to 1994-04-18; source msha-controller-operator-history
- **operator_operates_mine:** Jordan L Coal Company → Jordan #1 Slope; 1994-04-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sheldon  Derck → Jordan #1 Slope; 1994-04-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sheldon  Derck → Jordan L Coal Company; 1994-04-19 to current/open; source msha-controller-operator-history