# Relationship history for MSHA mine 3607712

Current hierarchy: **Jack  Foust; Robert  Foust → Foust Excavating → FOUST GRAVEL PIT**

- 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:** Virgil Foust Sand & Gravel → FOUST GRAVEL PIT; 1985-07-01 to 1991-10-30; source msha-controller-operator-history
- **controller_controls_mine:** Virgil  Foust → FOUST GRAVEL PIT; 1985-07-01 to 1991-10-30; source msha-controller-operator-history
- **controller_controls_operator:** Virgil  Foust → Virgil Foust Sand & Gravel; 1985-07-01 to 1991-10-30; source msha-controller-operator-history
- **operator_operates_mine:** Foust Excavating → FOUST GRAVEL PIT; 1991-10-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert  Foust  et al → FOUST GRAVEL PIT; 1991-10-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Foust  et al → Foust Excavating; 1991-10-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jack  Foust  et al → Foust Excavating; 1991-10-31 to current/open; source msha-controller-operator-history