# Relationship history for MSHA mine 4100006

Current hierarchy: **United States Lime & Minerals Inc → Texas Lime Company → Blum Plant**

- 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:** Rangaire Corp → Blum Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dravo Corp → Blum Plant; 1950-01-01 to 1998-11-24; source msha-controller-operator-history
- **operator_operates_mine:** Round Rock Lime Company → Blum Plant; 1978-03-09 to 1978-04-26; source msha-controller-operator-history
- **controller_controls_mine:** A A Capital Corp → Blum Plant; 1978-03-09 to 1978-04-26; source msha-controller-operator-history
- **controller_controls_operator:** A A Capital Corp → Round Rock Lime Company; 1978-03-09 to 1978-04-26; source msha-controller-operator-history
- **operator_operates_mine:** Round Rock Lime Company → Blum Plant; 1978-04-27 to 1979-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Southern Industries Inc → Blum Plant; 1978-04-27 to 1979-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Southern Industries Inc → Round Rock Lime Company; 1978-04-27 to 1979-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Dravo Lime Company → Blum Plant; 1979-06-01 to 1989-06-02; source msha-controller-operator-history
- **controller_controls_operator:** Dravo Corp → Dravo Lime Company; 1979-06-01 to 1989-06-02; source msha-controller-operator-history
- **operator_operates_mine:** Texas Lime Company → Blum Plant; 1989-06-03 to 1989-08-19; source msha-controller-operator-history
- **controller_controls_operator:** Rangaire Corp → Texas Lime Company; 1989-06-03 to 1989-08-19; source msha-controller-operator-history
- **operator_operates_mine:** Texas Lime Company → Blum Plant; 1989-08-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** United States Lime & Minerals Inc → Blum Plant; 1989-08-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** United States Lime & Minerals Inc → Texas Lime Company; 1989-08-20 to current/open; source msha-controller-operator-history