# Relationship history for MSHA mine 0202979

Current hierarchy: **Ted  Cook → TLC Excavating, Inc. → Portable Materials**

- 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:** TLC Excavating, Inc. → Portable Materials; 2002-05-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ted  Cook → Portable Materials; 2002-05-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ted  Cook → TLC Excavating, Inc.; 2002-05-29 to current/open; source msha-controller-operator-history