# Relationship history for MSHA mine 3607110

Current hierarchy: **Lettich Gene A → Red Ash Mining → Four 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Red Ash Mining → Four Vein Slope; 1981-04-01 to 1990-12-16; source msha-controller-operator-history
- **controller_controls_mine:** Hatter Jacques E & Donald E Scheib → Four Vein Slope; 1981-04-01 to 1990-12-16; source msha-controller-operator-history
- **controller_controls_operator:** Hatter Jacques E & Donald E Scheib → Red Ash Mining; 1981-04-01 to 1990-12-16; source msha-controller-operator-history
- **operator_operates_mine:** Red Ash Mining → Four Vein Slope; 1990-12-17 to 1992-04-19; source msha-controller-operator-history
- **controller_controls_mine:** Donofrio Robert Et Al → Four Vein Slope; 1990-12-17 to 1992-04-19; source msha-controller-operator-history
- **controller_controls_operator:** Donofrio Robert Et Al → Red Ash Mining; 1990-12-17 to 1992-04-19; source msha-controller-operator-history
- **operator_operates_mine:** Red Ash Mining → Four Vein Slope; 1992-04-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lettich Gene A Et Al → Four Vein Slope; 1992-04-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lettich Gene A Et Al → Red Ash Mining; 1992-04-20 to current/open; source msha-controller-operator-history