# Relationship history for MSHA mine 4104918

Current hierarchy: **JAAR Trust; Robert  Deanda; Jennifer  Ruff; Michael  Ruff → Premium Sandstone → Premium Sandstone Quarry**

- 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:** Premium Sandstone → Premium Sandstone Quarry; 2011-11-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Joel  Taylor et al → Premium Sandstone Quarry; 2011-11-28 to 2021-08-29; source msha-controller-operator-history
- **controller_controls_operator:** Joel  Taylor et al → Premium Sandstone; 2011-11-28 to 2021-08-29; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Ruff et al → Premium Sandstone; 2011-11-28 to 2021-08-29; source msha-controller-operator-history
- **controller_controls_mine:** JAAR Trust et al → Premium Sandstone Quarry; 2021-08-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** JAAR Trust et al → Premium Sandstone; 2021-08-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Ruff et al → Premium Sandstone; 2021-08-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jennifer  Ruff et al → Premium Sandstone; 2021-08-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Deanda et al → Premium Sandstone; 2021-08-30 to current/open; source msha-controller-operator-history