# Relationship history for MSHA mine 4608220

Current hierarchy: **Jeffrey B  Sayers → Coal Valley Mining Inc → Mine No 2**

- 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

- **controller_controls_mine:** Black William E → Mine No 2; 1991-09-17 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ridgeway Development Corp → Mine No 2; 1992-09-01 to 1995-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Black William E → Ridgeway Development Corp; 1992-09-01 to 1995-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Charles E  Redden → Mine No 2; 1994-08-29 to 1995-10-08; source msha-controller-operator-history
- **operator_operates_mine:** Coal Valley Mining Inc → Mine No 2; 1995-05-01 to 1995-10-08; source msha-controller-operator-history
- **controller_controls_operator:** Charles E  Redden → Coal Valley Mining Inc; 1995-05-01 to 1995-10-08; source msha-controller-operator-history
- **controller_controls_mine:** Jeffrey B  Sayers → Mine No 2; 1995-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Coal Valley Mining Inc → Mine No 2; 1995-10-09 to 1997-10-06; source msha-controller-operator-history
- **controller_controls_operator:** Jeffrey B  Sayers → Coal Valley Mining Inc; 1995-10-09 to 1997-10-06; source msha-controller-operator-history
- **operator_operates_mine:** S & S Leasing Inc → Mine No 2; 1997-10-07 to 1999-06-14; source msha-controller-operator-history
- **controller_controls_mine:** Henry Dale  Shrewsbury → Mine No 2; 1997-10-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Henry Dale  Shrewsbury → S & S Leasing Inc; 1997-10-07 to 1999-06-14; source msha-controller-operator-history
- **operator_operates_mine:** Coal Valley Mining Inc → Mine No 2; 1999-06-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeffrey B  Sayers → Coal Valley Mining Inc; 1999-06-15 to current/open; source msha-controller-operator-history