# Relationship history for MSHA mine 1517964

Current hierarchy: **Charles T  Norman → Sassy Coal Co., Inc. → No 4**

- 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:** John Madison  Potter et al → No 4; 1995-11-22 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Jaw Bone Coal Corp → No 4; 1997-08-01 to 2003-04-08; source msha-controller-operator-history
- **controller_controls_operator:** John Madison  Potter et al → Jaw Bone Coal Corp; 1997-08-01 to 2003-04-08; source msha-controller-operator-history
- **controller_controls_operator:** David Nelson  Potter et al → Jaw Bone Coal Corp; 1997-08-01 to 2003-04-08; source msha-controller-operator-history
- **controller_controls_mine:** Charles T  Norman → No 4; 2001-09-24 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Linn Branch Coal Incorporated → No 4; 2003-04-09 to 2003-11-07; source msha-controller-operator-history
- **controller_controls_mine:** Kenneth L  Farley et al → No 4; 2003-04-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kenneth L  Farley et al → Linn Branch Coal Incorporated; 2003-04-09 to 2003-11-07; source msha-controller-operator-history
- **operator_operates_mine:** Sassy Coal Co., Inc. → No 4; 2003-11-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles T  Norman → Sassy Coal Co., Inc.; 2003-11-08 to current/open; source msha-controller-operator-history