# Relationship history for MSHA mine 0102940

Current hierarchy: **Otis  Skinner → Swasher Inc → Universal #1**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Skinner Coal Washer Inc → Universal #1; 1992-01-01 to 1996-01-24; source msha-controller-operator-history
- **controller_controls_mine:** Otis  Skinner → Universal #1; 1992-01-01 to 1996-01-24; source msha-controller-operator-history
- **controller_controls_operator:** Otis  Skinner → Skinner Coal Washer Inc; 1992-01-01 to 1996-01-24; source msha-controller-operator-history
- **controller_controls_mine:** Ronald S  Bryant et al → Universal #1; 1994-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Colonial Contracting Inc → Universal #1; 1996-01-25 to 1996-12-16; source msha-controller-operator-history
- **controller_controls_operator:** Ronald S  Bryant et al → Colonial Contracting Inc; 1996-01-25 to 1996-12-16; source msha-controller-operator-history
- **operator_operates_mine:** Swasher Inc → Universal #1; 1996-12-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Otis  Skinner → Universal #1; 1996-12-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Otis  Skinner → Swasher Inc; 1996-12-17 to current/open; source msha-controller-operator-history