# Relationship history for MSHA mine 2901772

Current hierarchy: **Lafarge S A → Western Mobile Northern Inc → Portable Plant #18**

- 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

- **controller_controls_mine:** Estate of Henry T. Southway Jr. → Portable Plant #18; 1978-03-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Angel Fire Corp → Portable Plant #18; 1979-01-01 to 1979-05-31; source msha-controller-operator-history
- **controller_controls_mine:** A Z L Resources → Portable Plant #18; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** A Z L Resources → Angel Fire Corp; 1979-01-01 to 1979-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Duke City Lumber Company → Portable Plant #18; 1979-06-01 to 1980-01-21; source msha-controller-operator-history
- **controller_controls_mine:** Duke City Lumber Company → Portable Plant #18; 1979-06-01 to 1980-01-21; source msha-controller-operator-history
- **controller_controls_operator:** Duke City Lumber Company → Duke City Lumber Company; 1979-06-01 to 1980-01-21; source msha-controller-operator-history
- **operator_operates_mine:** Southway Const Co Inc & Asphalt Gravel Prod Inc → Portable Plant #18; 1980-01-22 to 1980-12-14; source msha-controller-operator-history
- **controller_controls_operator:** Estate of Henry T. Southway Jr. → Southway Const Co Inc & Asphalt Gravel Prod Inc; 1980-01-22 to 1980-12-14; source msha-controller-operator-history
- **operator_operates_mine:** Angel Fire Corp → Portable Plant #18; 1980-12-15 to 1981-09-10; source msha-controller-operator-history
- **controller_controls_operator:** A Z L Resources → Angel Fire Corp; 1980-12-15 to 1981-09-10; source msha-controller-operator-history
- **operator_operates_mine:** Southway Construction Company Inc → Portable Plant #18; 1981-09-11 to 1998-03-14; source msha-controller-operator-history
- **controller_controls_mine:** Estate of Henry T. Southway Jr. → Portable Plant #18; 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 1998-03-14; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → Portable Plant #18; 1998-02-11 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Western Mobile Northern Inc → Portable Plant #18; 1998-03-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Western Mobile Northern Inc; 1998-03-15 to current/open; source msha-controller-operator-history