# Relationship history for MSHA mine 0503533

Current hierarchy: **Saguache County - Co → Saguache County → Center Dump Pit**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Estate of Henry T. Southway Jr. → Center Dump Pit; 1978-03-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Southway Const Co Inc & Asphalt Gravel Prod Inc → Center Dump Pit; 1980-02-01 to 1988-02-02; source msha-controller-operator-history
- **controller_controls_operator:** Estate of Henry T. Southway Jr. → Southway Const Co Inc & Asphalt Gravel Prod Inc; 1980-02-01 to 1988-02-02; source msha-controller-operator-history
- **controller_controls_mine:** Saguache County - Co → Center Dump Pit; 1988-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Saguache County → Center Dump Pit; 1988-02-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Saguache County - Co → Saguache County; 1988-02-03 to current/open; source msha-controller-operator-history