# Relationship history for MSHA mine 4606478

Current hierarchy: **Everett E  Ballard Jr → Ballard Brothers Coal Inc → Bend Branch No 3/4**

- 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:** United  Company → Bend Branch No 3/4; 1978-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Dal-Tex Coal Corp → Bend Branch No 3/4; 1982-02-01 to 1986-08-24; source msha-controller-operator-history
- **controller_controls_operator:** United  Company → Dal-Tex Coal Corp; 1982-02-01 to 1986-08-24; source msha-controller-operator-history
- **operator_operates_mine:** Sharples Coal Corp → Bend Branch No 3/4; 1986-08-25 to 1992-03-14; source msha-controller-operator-history
- **controller_controls_mine:** Allen T  Workman Jr → Bend Branch No 3/4; 1986-08-25 to 1992-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Allen T  Workman Jr → Sharples Coal Corp; 1986-08-25 to 1992-03-14; source msha-controller-operator-history
- **controller_controls_mine:** Everett E  Ballard Jr → Bend Branch No 3/4; 1991-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ballard Brothers Coal Inc → Bend Branch No 3/4; 1992-03-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Everett E  Ballard Jr → Ballard Brothers Coal Inc; 1992-03-15 to current/open; source msha-controller-operator-history