# Relationship history for MSHA mine 2003235

Current hierarchy: **David J  Crimmins; Roger C  Crimmins → A LINDBERG & SONS INC → EXTEC 14  X  30 TROMMEL**

- 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:** David J  Crimmins et al → EXTEC 14  X  30 TROMMEL; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** A LINDBERG & SONS INC → EXTEC 14  X  30 TROMMEL; 2002-01-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David J  Crimmins et al → A LINDBERG & SONS INC; 2002-01-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roger C  Crimmins et al → A LINDBERG & SONS INC; 2002-01-24 to current/open; source msha-controller-operator-history