# Relationship history for MSHA mine 1512110

Current hierarchy: **Sams Dexter R → Darr & Associates Corp → Tipple**

- 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:** Darr & Associates Corp → Tipple; 1979-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sams Dexter R → Tipple; 1979-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sams Dexter R → Darr & Associates Corp; 1979-10-01 to current/open; source msha-controller-operator-history