# Relationship history for MSHA mine 4606111

Current hierarchy: **Matney Danny → D & B Coal Company Inc → No 1 Surface**

- 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:** Matney Danny Et Al → No 1 Surface; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mitchell Iverson → No 1 Surface; 1979-12-21 to 1983-02-15; source msha-controller-operator-history
- **operator_operates_mine:** Mitchell Energy Corp → No 1 Surface; 1980-01-01 to 1982-12-27; source msha-controller-operator-history
- **controller_controls_operator:** Mitchell Iverson → Mitchell Energy Corp; 1980-01-01 to 1982-12-27; source msha-controller-operator-history
- **controller_controls_mine:** Epling Walter Ben & Michael R → No 1 Surface; 1981-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Elkhorn Drilling Company → No 1 Surface; 1982-12-28 to 1983-10-04; source msha-controller-operator-history
- **controller_controls_operator:** Epling Walter Ben & Michael R → Elkhorn Drilling Company; 1982-12-28 to 1983-10-04; source msha-controller-operator-history
- **operator_operates_mine:** D & B Coal Company Inc → No 1 Surface; 1983-10-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Matney Danny Et Al → D & B Coal Company Inc; 1983-10-05 to current/open; source msha-controller-operator-history