# Relationship history for MSHA mine 3606078

Current hierarchy: **Cemex S A → Kosmos Cement Company → COSMOS CEMENT CO. PITTSBURGH**

- 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:** Marquette Company → COSMOS CEMENT CO. PITTSBURGH; 1950-01-01 to 1982-04-14; source msha-controller-operator-history
- **controller_controls_mine:** Gulf + Western Industries Inc → COSMOS CEMENT CO. PITTSBURGH; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gulf + Western Industries Inc → Marquette Company; 1950-01-01 to 1982-04-14; source msha-controller-operator-history
- **controller_controls_mine:** Lone Star Industries Inc → COSMOS CEMENT CO. PITTSBURGH; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lone Star Cement Inc → COSMOS CEMENT CO. PITTSBURGH; 1982-04-15 to 1988-06-26; source msha-controller-operator-history
- **controller_controls_operator:** Lone Star Industries Inc → Lone Star Cement Inc; 1982-04-15 to 1988-06-26; source msha-controller-operator-history
- **operator_operates_mine:** Kosmos Cement Company → COSMOS CEMENT CO. PITTSBURGH; 1988-06-27 to 2000-11-05; source msha-controller-operator-history
- **controller_controls_mine:** Southdown Inc → COSMOS CEMENT CO. PITTSBURGH; 1988-06-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Southdown Inc → Kosmos Cement Company; 1988-06-27 to 2000-11-05; source msha-controller-operator-history
- **operator_operates_mine:** Kosmos Cement Company → COSMOS CEMENT CO. PITTSBURGH; 2000-11-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cemex S A → COSMOS CEMENT CO. PITTSBURGH; 2000-11-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cemex S A → Kosmos Cement Company; 2000-11-06 to current/open; source msha-controller-operator-history