# Relationship history for MSHA mine 2400792

Current hierarchy: **Travis  Haynes → Montana Aggregate Holdings Inc → Sheridan Ready Mix**

- 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:** Sheridan Ready-Mix, Inc. → Sheridan Ready Mix; 1950-01-01 to 2008-08-11; source msha-controller-operator-history
- **controller_controls_mine:** Elizabeth  Evenson et al → Sheridan Ready Mix; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Elizabeth  Evenson et al → Sheridan Ready-Mix, Inc.; 1950-01-01 to 2008-08-11; source msha-controller-operator-history
- **operator_operates_mine:** Montana Aggregate Holdings Inc → Sheridan Ready Mix; 2008-08-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Travis  Haynes et al → Sheridan Ready Mix; 2008-08-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Travis  Haynes et al → Montana Aggregate Holdings Inc; 2008-08-12 to current/open; source msha-controller-operator-history