# Relationship history for MSHA mine 1202185

Current hierarchy: **Fred (Pete)  Irving → IMI Aggregates LLC → imi Columbus 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

- **controller_controls_mine:** Fred (Pete)  Irving → imi Columbus Sand & Gravel; 1950-01-01 to 2005-12-04; source msha-controller-operator-history
- **controller_controls_mine:** Lester L  Lee → imi Columbus Sand & Gravel; 1983-02-22 to 2016-02-29; source msha-controller-operator-history
- **operator_operates_mine:** County Materials Inc → imi Columbus Sand & Gravel; 1995-12-01 to 2018-10-04; source msha-controller-operator-history
- **controller_controls_operator:** Lester L  Lee → County Materials Inc; 1995-12-01 to 2016-02-29; source msha-controller-operator-history
- **controller_controls_mine:** Earl  Brinker et al → imi Columbus Sand & Gravel; 2005-12-05 to 2018-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Larry L  Lee → imi Columbus Sand & Gravel; 2016-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Larry L  Lee → County Materials Inc; 2016-03-01 to 2018-10-04; source msha-controller-operator-history
- **operator_operates_mine:** Irving Materials Inc. → imi Columbus Sand & Gravel; 2018-10-05 to 2020-09-07; source msha-controller-operator-history
- **controller_controls_operator:** Earl  Brinker et al → Irving Materials Inc.; 2018-10-05 to 2018-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Fred (Pete)  Irving → Irving Materials Inc.; 2018-10-05 to 2005-12-04; source msha-controller-operator-history
- **controller_controls_mine:** John  Tiberi → imi Columbus Sand & Gravel; 2019-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Tiberi → Irving Materials Inc.; 2019-01-01 to 2020-09-07; source msha-controller-operator-history
- **operator_operates_mine:** IMI Aggregates LLC → imi Columbus Sand & Gravel; 2020-09-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Fred (Pete)  Irving → imi Columbus Sand & Gravel; 2020-09-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fred (Pete)  Irving → IMI Aggregates LLC; 2020-09-08 to current/open; source msha-controller-operator-history