# Relationship history for MSHA mine 2102953

Current hierarchy: **Edward A Egan → Northern Con-Agg Inc → 50-V E**

- 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:** Blum Inc → 50-V E; 1986-11-01 to 1989-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Dave  Blum → 50-V E; 1986-11-01 to 1989-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Dave  Blum → Blum Inc; 1986-11-01 to 1989-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Ronald M Anderson → 50-V E; 1986-12-18 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Northern Con-Agg Inc → 50-V E; 1989-07-01 to 1989-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Ronald M Anderson → Northern Con-Agg Inc; 1989-07-01 to 1989-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Northern Con-Agg Inc → 50-V E; 1989-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Edward A Egan → 50-V E; 1989-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Edward A Egan → Northern Con-Agg Inc; 1989-09-01 to current/open; source msha-controller-operator-history