# Relationship history for MSHA mine 1700734

Current hierarchy: **Gary  Tibbetts → GL TIBBETTS EXCAVATION INC → CEDAR RAPIDS PORTABLE CRUSHER**

- 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:** GL TIBBETTS EXCAVATION INC → CEDAR RAPIDS PORTABLE CRUSHER; 2002-08-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gary  Tibbetts → CEDAR RAPIDS PORTABLE CRUSHER; 2002-08-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gary  Tibbetts → GL TIBBETTS EXCAVATION INC; 2002-08-08 to current/open; source msha-controller-operator-history