# Relationship history for MSHA mine 4406272

Current hierarchy: **Bise Norma L → Contract Auger Inc → No 1 Auger**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Hayes & Elkins Inc → No 1 Auger; 1985-12-01 to 1986-08-20; source msha-controller-operator-history
- **controller_controls_mine:** Elkins Charles C Et Al → No 1 Auger; 1985-12-01 to 1986-08-20; source msha-controller-operator-history
- **controller_controls_operator:** Elkins Charles C Et Al → Hayes & Elkins Inc; 1985-12-01 to 1986-08-20; source msha-controller-operator-history
- **operator_operates_mine:** Contract Auger Inc → No 1 Auger; 1986-08-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bise Norma L → No 1 Auger; 1986-08-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bise Norma L → Contract Auger Inc; 1986-08-21 to current/open; source msha-controller-operator-history