# Relationship history for MSHA mine 2901890

Current hierarchy: **Holtman Dirk → Danac Construction Corp → Danac No 1**

- 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:** Southway Construction Company Inc → Danac No 1; 1982-10-01 to 1989-07-13; source msha-controller-operator-history
- **controller_controls_mine:** Estate of Henry T. Southway Jr. → Danac No 1; 1982-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Estate of Henry T. Southway Jr. → Southway Construction Company Inc; 1982-10-01 to 1989-07-13; source msha-controller-operator-history
- **operator_operates_mine:** Danac Construction Corp → Danac No 1; 1989-07-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Holtman Dirk → Danac No 1; 1989-07-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holtman Dirk → Danac Construction Corp; 1989-07-14 to current/open; source msha-controller-operator-history