# Relationship history for MSHA mine 3002718

Current hierarchy: **Daniel R Gernatt Jr → Gernatt Asphalt Products Inc → Sardinia Sand & Gravel**

- 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:** Dan  Gernatt Sr et al → Sardinia Sand & Gravel; 1979-11-01 to 2014-05-04; source msha-controller-operator-history
- **operator_operates_mine:** Sardinia Sand & Gravel → Sardinia Sand & Gravel; 1986-04-01 to 1986-10-12; source msha-controller-operator-history
- **controller_controls_mine:** John  Mathis → Sardinia Sand & Gravel; 1986-04-01 to 1986-10-12; source msha-controller-operator-history
- **controller_controls_operator:** John  Mathis → Sardinia Sand & Gravel; 1986-04-01 to 1986-10-12; source msha-controller-operator-history
- **operator_operates_mine:** Gernatt Asphalt Products Inc → Sardinia Sand & Gravel; 1986-10-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dan  Gernatt Sr et al → Gernatt Asphalt Products Inc; 1986-10-13 to 2014-05-04; source msha-controller-operator-history
- **controller_controls_mine:** Daniel R Gernatt Jr et al → Sardinia Sand & Gravel; 2014-05-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daniel R Gernatt Jr et al → Gernatt Asphalt Products Inc; 2014-05-05 to current/open; source msha-controller-operator-history