# Relationship history for MSHA mine 2103759

Current hierarchy: **Douglas  Ims → Integrity Material Sales Inc → Portable Screener #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

- **controller_controls_mine:** Don  Redman et al → Portable Screener #2; 2011-08-05 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Medford Sand and Gravel → Portable Screener #2; 2012-05-16 to 2024-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Don  Redman et al → Medford Sand and Gravel; 2012-05-16 to 2024-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Sue  Redman et al → Medford Sand and Gravel; 2012-05-16 to 2024-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Douglas  Ims → Portable Screener #2; 2024-03-26 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Integrity Material Sales Inc → Portable Screener #2; 2024-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Douglas  Ims → Integrity Material Sales Inc; 2024-04-01 to current/open; source msha-controller-operator-history