# Relationship history for MSHA mine 3607575

Current hierarchy: **Donofrio Robert → Skyview Coal Company → 1 1/2 Vein Slope**

- 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

- **controller_controls_mine:** Glosek Edward Et Al → 1 1/2 Vein Slope; 1974-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sky View Coal Company → 1 1/2 Vein Slope; 1984-05-01 to 1989-08-10; source msha-controller-operator-history
- **controller_controls_operator:** Glosek Edward Et Al → Sky View Coal Company; 1984-05-01 to 1989-08-10; source msha-controller-operator-history
- **operator_operates_mine:** Skyview Coal Company → 1 1/2 Vein Slope; 1989-08-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Donofrio Robert Et Al → 1 1/2 Vein Slope; 1989-08-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donofrio Robert Et Al → Skyview Coal Company; 1989-08-11 to current/open; source msha-controller-operator-history