# Relationship history for MSHA mine 1200841

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

- 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:** Fred (Pete)  Irving → imi Markle Quarry; 1950-01-01 to 2005-12-04; source msha-controller-operator-history
- **operator_operates_mine:** Irving Brothers Gravel Company Inc → imi Markle Quarry; 1950-01-01 to 1994-05-19; source msha-controller-operator-history
- **controller_controls_mine:** Irving Brothers Gravel Company Inc → imi Markle Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Irving Brothers Gravel Company Inc → Irving Brothers Gravel Company Inc; 1950-01-01 to 1994-05-19; source msha-controller-operator-history
- **operator_operates_mine:** Irving Materials Inc → imi Markle Quarry; 1994-05-20 to 2023-01-09; source msha-controller-operator-history
- **controller_controls_operator:** Fred (Pete)  Irving → Irving Materials Inc; 1994-05-20 to 2005-12-04; source msha-controller-operator-history
- **controller_controls_mine:** Earl  Brinker et al → imi Markle Quarry; 2005-12-05 to 2018-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Earl  Brinker et al → Irving Materials Inc; 2005-12-05 to 2018-12-31; source msha-controller-operator-history
- **controller_controls_mine:** John  Tiberi → imi Markle Quarry; 2019-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Tiberi → Irving Materials Inc; 2019-01-01 to 2023-01-09; source msha-controller-operator-history
- **controller_controls_mine:** Fred (Pete)  Irving → imi Markle Quarry; 2020-09-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** IMI Aggregates LLC → imi Markle Quarry; 2023-01-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fred (Pete)  Irving → IMI Aggregates LLC; 2023-01-10 to current/open; source msha-controller-operator-history