# Relationship history for MSHA mine 2600668

Current hierarchy: **Arcosa, Inc → Arcosa Specialty Mtls → Arcosa ADAMS CLAIM #1850**

- 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:** ACG Materials → Arcosa ADAMS CLAIM #1850; 1950-01-01 to 2018-12-05; source msha-controller-operator-history
- **controller_controls_mine:** Art  Wilson → Arcosa ADAMS CLAIM #1850; 1950-01-01 to 2015-08-04; source msha-controller-operator-history
- **controller_controls_operator:** Art  Wilson → ACG Materials; 1950-01-01 to 2015-08-04; source msha-controller-operator-history
- **controller_controls_mine:** H I G Capital LLC → Arcosa ADAMS CLAIM #1850; 2015-08-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** H I G Capital LLC → ACG Materials; 2015-08-05 to 2018-12-05; source msha-controller-operator-history
- **operator_operates_mine:** Arcosa Specialty Mtls → Arcosa ADAMS CLAIM #1850; 2018-12-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Arcosa, Inc → Arcosa ADAMS CLAIM #1850; 2018-12-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Arcosa, Inc → Arcosa Specialty Mtls; 2018-12-06 to current/open; source msha-controller-operator-history