# Relationship history for MSHA mine 4502509

Current hierarchy: **Steve  Herman → Loon Lake Sand & Gravel LLC → LOON LAKE 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** G & C Excavating Inc → LOON LAKE SAND & GRAVEL; 1950-01-01 to 1985-07-10; source msha-controller-operator-history
- **controller_controls_mine:** Forrest  Gardner → LOON LAKE SAND & GRAVEL; 1950-01-01 to 1985-07-10; source msha-controller-operator-history
- **controller_controls_operator:** Forrest  Gardner → G & C Excavating Inc; 1950-01-01 to 1985-07-10; source msha-controller-operator-history
- **operator_operates_mine:** Coombs Sand & Gravel → LOON LAKE SAND & GRAVEL; 1985-07-11 to 1995-06-11; source msha-controller-operator-history
- **controller_controls_mine:** Jon A  Coombs → LOON LAKE SAND & GRAVEL; 1985-07-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jon A  Coombs → Coombs Sand & Gravel; 1985-07-11 to 1995-06-11; source msha-controller-operator-history
- **operator_operates_mine:** Loon Lake Sand & Gravel Inc → LOON LAKE SAND & GRAVEL; 1995-06-12 to 2012-06-04; source msha-controller-operator-history
- **controller_controls_mine:** Steve  Herman → LOON LAKE SAND & GRAVEL; 1995-06-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steve  Herman → Loon Lake Sand & Gravel Inc; 1995-06-12 to 2012-06-04; source msha-controller-operator-history
- **operator_operates_mine:** Loon Lake Sand & Gravel LLC → LOON LAKE SAND & GRAVEL; 2012-06-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Steve  Herman → LOON LAKE SAND & GRAVEL; 2012-06-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steve  Herman → Loon Lake Sand & Gravel LLC; 2012-06-05 to current/open; source msha-controller-operator-history