# Relationship history for MSHA mine 4606381

Current hierarchy: **Mowry W Thomas → P E I Inc → Mine No 1**

- 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:** Prestwood Company Inc → Mine No 1; 1981-08-01 to 1989-08-30; source msha-controller-operator-history
- **controller_controls_mine:** Hardesty John R Jr-Larry A Myers Et Al → Mine No 1; 1981-08-01 to 1989-08-30; source msha-controller-operator-history
- **controller_controls_operator:** Hardesty John R Jr-Larry A Myers Et Al → Prestwood Company Inc; 1981-08-01 to 1989-08-30; source msha-controller-operator-history
- **operator_operates_mine:** P E I Inc → Mine No 1; 1989-08-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mowry W Thomas → Mine No 1; 1989-08-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mowry W Thomas → P E I Inc; 1989-08-31 to current/open; source msha-controller-operator-history