# Relationship history for MSHA mine 2102795

Current hierarchy: **Angiline C  Nelson → Elbow Lake Sand & Gravel Inc → Elbow Lake Sand & Gravel Incorporated**

- 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

- **controller_controls_mine:** Wayne  Lee → Elbow Lake Sand & Gravel Incorporated; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Wayne Lee Excavating → Elbow Lake Sand & Gravel Incorporated; 1980-05-01 to 1987-02-03; source msha-controller-operator-history
- **controller_controls_operator:** Wayne  Lee → Wayne Lee Excavating; 1980-05-01 to 1987-02-03; source msha-controller-operator-history
- **operator_operates_mine:** Elbow Lake Sand & Gravel Inc → Elbow Lake Sand & Gravel Incorporated; 1987-02-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Angiline C  Nelson → Elbow Lake Sand & Gravel Incorporated; 1987-02-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Angiline C  Nelson → Elbow Lake Sand & Gravel Inc; 1987-02-04 to current/open; source msha-controller-operator-history