# Relationship history for MSHA mine 3901586

Current hierarchy: **Douglas H  Carlson; Jamison D  Carlson → Carlson Crushing & Excavating LLC → Crusher #1**

- 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:** Carlson Crushing & Excavating LLC → Crusher #1; 2012-03-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jamison D  Carlson et al → Crusher #1; 2012-03-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jamison D  Carlson et al → Carlson Crushing & Excavating LLC; 2012-03-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Douglas H  Carlson et al → Carlson Crushing & Excavating LLC; 2012-03-23 to current/open; source msha-controller-operator-history