# Relationship history for MSHA mine 1700945

Current hierarchy: **T Buck Construction Inc → Buck LLC → Thor Pit**

- 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:** D&H Construction, Inc. → Thor Pit; 2014-07-29 to 2016-10-29; source msha-controller-operator-history
- **controller_controls_mine:** Dan  Grover, Sr → Thor Pit; 2014-07-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dan  Grover, Sr → D&H Construction, Inc.; 2014-07-29 to 2016-10-29; source msha-controller-operator-history
- **operator_operates_mine:** Buck LLC → Thor Pit; 2016-10-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** T Buck Construction Inc → Thor Pit; 2016-10-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** T Buck Construction Inc → Buck LLC; 2016-10-30 to current/open; source msha-controller-operator-history