# Relationship history for MSHA mine 1200994

Current hierarchy: **Fred (Pete)  Irving → IMI Aggregates LLC. → Carroll County Sand & Gravel**

- 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

- **operator_operates_mine:** Rider'S Sand & Ready Mix → Carroll County Sand & Gravel; 1950-01-01 to 1992-03-16; source msha-controller-operator-history
- **controller_controls_mine:** Leo C  Rider → Carroll County Sand & Gravel; 1950-01-01 to 1992-03-16; source msha-controller-operator-history
- **controller_controls_operator:** Leo C  Rider → Rider'S Sand & Ready Mix; 1950-01-01 to 1992-03-16; source msha-controller-operator-history
- **operator_operates_mine:** Segal's Sand and Gravel Co → Carroll County Sand & Gravel; 1992-03-17 to 2023-12-17; source msha-controller-operator-history
- **controller_controls_mine:** Timothy L  Segal → Carroll County Sand & Gravel; 1992-03-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Timothy L  Segal → Segal's Sand and Gravel Co; 1992-03-17 to 2023-12-17; source msha-controller-operator-history
- **controller_controls_mine:** Fred (Pete)  Irving → Carroll County Sand & Gravel; 2020-09-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** IMI Aggregates LLC. → Carroll County Sand & Gravel; 2023-12-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fred (Pete)  Irving → IMI Aggregates LLC.; 2023-12-18 to current/open; source msha-controller-operator-history