# Relationship history for MSHA mine 1401260

Current hierarchy: **Cullison Jim I & Jack → Cullison Brothers Sand → Cullison Brothers Sand**

- 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

- **operator_operates_mine:** Riverside Sand Inc → Cullison Brothers Sand; 1950-01-01 to 1984-05-06; source msha-controller-operator-history
- **controller_controls_mine:** Walker W S → Cullison Brothers Sand; 1950-01-01 to 1984-05-06; source msha-controller-operator-history
- **controller_controls_operator:** Walker W S → Riverside Sand Inc; 1950-01-01 to 1984-05-06; source msha-controller-operator-history
- **operator_operates_mine:** Cullison Brothers Sand → Cullison Brothers Sand; 1984-05-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cullison Jim I & Jack → Cullison Brothers Sand; 1984-05-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cullison Jim I & Jack → Cullison Brothers Sand; 1984-05-07 to current/open; source msha-controller-operator-history