# Relationship history for MSHA mine 3304327

Current hierarchy: **Christopher  Harris; Phillip  Tucker → C E T M Inc → Pleasant Valley Limestone**

- 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:** C E T M Inc → Pleasant Valley Limestone; 1994-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** George V  Thompson → Pleasant Valley Limestone; 1994-04-01 to 2021-05-31; source msha-controller-operator-history
- **controller_controls_operator:** George V  Thompson → C E T M Inc; 1994-04-01 to 2021-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Phillip  Tucker et al → Pleasant Valley Limestone; 2021-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Phillip  Tucker et al → C E T M Inc; 2021-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Christopher  Harris et al → C E T M Inc; 2021-06-01 to current/open; source msha-controller-operator-history