# Relationship history for MSHA mine 4300012

Current hierarchy: **Edward  Vladyka; Jonathan  Hill → GREENSTONE SLATE COMPANY → QUARRY SLATE IND.**

- 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

- **operator_operates_mine:** Quarry Slate Industries → QUARRY SLATE IND.; 1950-01-01 to 2014-07-14; source msha-controller-operator-history
- **controller_controls_mine:** Richard L  Hill → QUARRY SLATE IND.; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard L  Hill → Quarry Slate Industries; 1950-01-01 to 2014-07-14; source msha-controller-operator-history
- **controller_controls_mine:** Richard L  Hill → QUARRY SLATE IND.; 2007-11-06 to 2024-01-17; source msha-controller-operator-history
- **operator_operates_mine:** Greenstone Slate Company → QUARRY SLATE IND.; 2014-07-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard L  Hill → Greenstone Slate Company; 2014-07-15 to 2024-01-17; source msha-controller-operator-history
- **controller_controls_mine:** Edward  Vladyka et al → QUARRY SLATE IND.; 2024-01-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Edward  Vladyka et al → Greenstone Slate Company; 2024-01-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jonathan  Hill et al → Greenstone Slate Company; 2024-01-18 to current/open; source msha-controller-operator-history