# Relationship history for MSHA mine 3608647

Current hierarchy: **Theodore  Yowonske; Michaelangelo P  Ripepi → Bullskin Tipple Company → Bullskin Tipple**

- 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:** Bullskin Tipple Company → Bullskin Tipple; 1997-06-01 to 1999-12-30; source msha-controller-operator-history
- **controller_controls_mine:** Ripepi Michaelangelo & Elton Coal Company → Bullskin Tipple; 1997-06-01 to 1999-12-30; source msha-controller-operator-history
- **controller_controls_operator:** Ripepi Michaelangelo & Elton Coal Company → Bullskin Tipple Company; 1997-06-01 to 1999-12-30; source msha-controller-operator-history
- **operator_operates_mine:** Bullskin Tipple Company → Bullskin Tipple; 1999-12-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Theodore  Yowonske et al → Bullskin Tipple; 1999-12-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Theodore  Yowonske et al → Bullskin Tipple Company; 1999-12-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michaelangelo P  Ripepi et al → Bullskin Tipple Company; 1999-12-31 to current/open; source msha-controller-operator-history