# Relationship history for MSHA mine 4104455

Current hierarchy: **Weldon E  Ratliff → Ratliff Ready Mix L.P. → Aquilla Sand and Gravel Ltd.**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **controller_controls_mine:** Ron L  Carlisle → Aquilla Sand and Gravel Ltd.; 2002-06-04 to 2007-04-02; source msha-controller-operator-history
- **operator_operates_mine:** Aquilla Sand & Gravel LTD → Aquilla Sand and Gravel Ltd.; 2003-12-23 to 2007-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Casey  Cameron  et al → Aquilla Sand and Gravel Ltd.; 2003-12-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Casey  Cameron  et al → Aquilla Sand & Gravel LTD; 2003-12-23 to 2007-12-31; source msha-controller-operator-history
- **controller_controls_operator:** R L  Hasty  et al → Aquilla Sand & Gravel LTD; 2003-12-23 to 2007-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Weldon E  Ratliff et al → Aquilla Sand and Gravel Ltd.; 2007-04-03 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ratliff Ready Mix L.P. → Aquilla Sand and Gravel Ltd.; 2008-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ron L  Carlisle → Ratliff Ready Mix L.P.; 2008-01-01 to 2007-04-02; source msha-controller-operator-history
- **controller_controls_operator:** Weldon E  Ratliff et al → Ratliff Ready Mix L.P.; 2008-01-01 to current/open; source msha-controller-operator-history