# Relationship history for MSHA mine 3608418

Current hierarchy: **Wilbur W  White Jr → Wilbur White Coal Co → J & B Mine**

- 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:** Gene B  Gangloff → J & B Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** J & B Coal Company → J & B Mine; 1993-06-01 to 1996-07-24; source msha-controller-operator-history
- **controller_controls_mine:** Carucci Robert & John Mudry → J & B Mine; 1993-06-01 to 1996-07-24; source msha-controller-operator-history
- **controller_controls_operator:** Carucci Robert & John Mudry → J & B Coal Company; 1993-06-01 to 1996-07-24; source msha-controller-operator-history
- **operator_operates_mine:** Hecla Machinery & Equipment Company → J & B Mine; 1996-07-25 to 2006-06-18; source msha-controller-operator-history
- **controller_controls_operator:** Gene B  Gangloff → Hecla Machinery & Equipment Company; 1996-07-25 to 2006-06-18; source msha-controller-operator-history
- **operator_operates_mine:** Wilbur White Coal Co → J & B Mine; 2006-06-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wilbur W  White Jr → J & B Mine; 2006-06-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wilbur W  White Jr → Wilbur White Coal Co; 2006-06-19 to current/open; source msha-controller-operator-history