# Relationship history for MSHA mine 1202143

Current hierarchy: **Fred (Pete)  Irving → IMI Aggregates LLC. → IMI Plymouth Plant 2**

- 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:** Stockberger Trucking LLC → IMI Plymouth Plant 2; 1993-04-01 to 2024-07-07; source msha-controller-operator-history
- **controller_controls_mine:** Carl D  Stockberger → IMI Plymouth Plant 2; 1993-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carl D  Stockberger → Stockberger Trucking LLC; 1993-04-01 to 2024-07-07; source msha-controller-operator-history
- **controller_controls_mine:** Fred (Pete)  Irving → IMI Plymouth Plant 2; 2020-09-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** IMI Aggregates LLC. → IMI Plymouth Plant 2; 2024-07-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fred (Pete)  Irving → IMI Aggregates LLC.; 2024-07-08 to current/open; source msha-controller-operator-history