# Relationship history for MSHA mine 4406749

Current hierarchy: **Steve  Wolford → Crystal Bay Corp → Mine No 2**

- 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:** MAPCO Inc → Mine No 2; 1989-10-25 to 1996-10-23; source msha-controller-operator-history
- **operator_operates_mine:** Permac Inc → Mine No 2; 1993-10-01 to 1994-09-05; source msha-controller-operator-history
- **controller_controls_operator:** MAPCO Inc → Permac Inc; 1993-10-01 to 1994-09-05; source msha-controller-operator-history
- **controller_controls_mine:** Steve  Wolford → Mine No 2; 1994-08-29 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Crystal Bay Corp → Mine No 2; 1994-09-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steve  Wolford → Crystal Bay Corp; 1994-09-06 to current/open; source msha-controller-operator-history