# Relationship history for MSHA mine 1517836

Current hierarchy: **Vincent Gregory N & Larry V Spencer → Western Kentucky Slurry Recovery Inc → 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:** Classic Recovery Systems → No 1; 1996-09-01 to 1997-05-19; source msha-controller-operator-history
- **controller_controls_mine:** Knight Perry → No 1; 1996-09-01 to 1997-05-19; source msha-controller-operator-history
- **controller_controls_operator:** Knight Perry → Classic Recovery Systems; 1996-09-01 to 1997-05-19; source msha-controller-operator-history
- **operator_operates_mine:** Mts Inc → No 1; 1997-05-20 to 1998-04-26; source msha-controller-operator-history
- **controller_controls_mine:** Boone Jimmy → No 1; 1997-05-20 to 1998-04-26; source msha-controller-operator-history
- **controller_controls_operator:** Boone Jimmy → Mts Inc; 1997-05-20 to 1998-04-26; source msha-controller-operator-history
- **operator_operates_mine:** Bull Creek Energy Inc → No 1; 1998-04-27 to 1998-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Crook James Ii → No 1; 1998-04-27 to 1998-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Crook James Ii → Bull Creek Energy Inc; 1998-04-27 to 1998-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Western Kentucky Slurry Recovery Inc → No 1; 1998-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Vincent Gregory N & Larry V Spencer → No 1; 1998-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vincent Gregory N & Larry V Spencer → Western Kentucky Slurry Recovery Inc; 1998-05-01 to current/open; source msha-controller-operator-history