# Relationship history for MSHA mine 3303705

Current hierarchy: **Cornett H H → Broadway Sand & Gravel Company Inc → Wenger Road Sand & Gravel Pit No 2**

- 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:** Cornett H H → Wenger Road Sand & Gravel Pit No 2; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Englewood Stone Corp → Wenger Road Sand & Gravel Pit No 2; 1978-03-09 to 1980-08-04; source msha-controller-operator-history
- **controller_controls_mine:** Davis Pauline → Wenger Road Sand & Gravel Pit No 2; 1978-03-09 to 1980-08-04; source msha-controller-operator-history
- **controller_controls_operator:** Davis Pauline → Englewood Stone Corp; 1978-03-09 to 1980-08-04; source msha-controller-operator-history
- **operator_operates_mine:** Broadway Sand & Gravel Company Inc → Wenger Road Sand & Gravel Pit No 2; 1980-08-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cornett H H → Broadway Sand & Gravel Company Inc; 1980-08-05 to current/open; source msha-controller-operator-history