# Relationship history for MSHA mine 1514156

Current hierarchy: **Dan  Chambers → Dean Chambers Trucking Inc → 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:** Dean Chambers Trucking Inc → Tipple; 1983-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dan  Chambers et al → Tipple; 1983-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dan  Chambers et al → Dean Chambers Trucking Inc; 1983-07-01 to current/open; source msha-controller-operator-history