# Relationship history for MSHA mine 4606918

Current hierarchy: **Fisher James → Bear Branch Coal Company → 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:** Joseph Coal Inc → Mine No 1; 1985-04-01 to 1986-04-06; source msha-controller-operator-history
- **controller_controls_mine:** Nelson Stanley → Mine No 1; 1985-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nelson Stanley → Joseph Coal Inc; 1985-04-01 to 1986-04-06; source msha-controller-operator-history
- **operator_operates_mine:** B & J Contractors → Mine No 1; 1986-04-07 to 1988-05-11; source msha-controller-operator-history
- **controller_controls_mine:** Shepperd William B → Mine No 1; 1986-04-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shepperd William B → B & J Contractors; 1986-04-07 to 1988-05-11; source msha-controller-operator-history
- **operator_operates_mine:** Bear Branch Coal Company → Mine No 1; 1988-05-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Fisher James → Mine No 1; 1988-05-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fisher James → Bear Branch Coal Company; 1988-05-12 to current/open; source msha-controller-operator-history