# Relationship history for MSHA mine 0200627

Current hierarchy: **Flo Ella  Kimpton → Kimpton'S Acme Sand & Gravel → ACME 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

- **operator_operates_mine:** Kimpton'S Acme Sand & Gravel → ACME SAND & GRAVEL; 1950-01-01 to 1998-01-02; source msha-controller-operator-history
- **controller_controls_mine:** Joe B  Kimpton Jr → ACME SAND & GRAVEL; 1950-01-01 to 1998-01-02; source msha-controller-operator-history
- **controller_controls_operator:** Joe B  Kimpton Jr → Kimpton'S Acme Sand & Gravel; 1950-01-01 to 1998-01-02; source msha-controller-operator-history
- **operator_operates_mine:** Kimpton'S Acme Sand & Gravel → ACME SAND & GRAVEL; 1998-01-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Flo Ella  Kimpton → ACME SAND & GRAVEL; 1998-01-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Flo Ella  Kimpton → Kimpton'S Acme Sand & Gravel; 1998-01-03 to current/open; source msha-controller-operator-history