# Relationship history for MSHA mine 4608462

Current hierarchy: **Donn A  Chickering → Peach Tree Ridge Mining, Inc. → Douglas No 1 Mine**

- 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:** Wyoming Pocahontas Land Company → Douglas No 1 Mine; 1994-11-01 to 1997-12-21; source msha-controller-operator-history
- **controller_controls_mine:** Donn A  Chickering → Douglas No 1 Mine; 1994-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donn A  Chickering → Wyoming Pocahontas Land Company; 1994-11-01 to 1997-12-21; source msha-controller-operator-history
- **operator_operates_mine:** P E S Enterprises Inc → Douglas No 1 Mine; 1997-12-22 to 2002-02-07; source msha-controller-operator-history
- **controller_controls_mine:** Paul E  Stover → Douglas No 1 Mine; 1997-12-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Paul E  Stover → P E S Enterprises Inc; 1997-12-22 to 2002-02-07; source msha-controller-operator-history
- **operator_operates_mine:** Peach Tree Ridge Mining, Inc. → Douglas No 1 Mine; 2002-02-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Donn A  Chickering → Douglas No 1 Mine; 2002-02-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donn A  Chickering → Peach Tree Ridge Mining, Inc.; 2002-02-08 to current/open; source msha-controller-operator-history