# Relationship history for MSHA mine 4607633

Current hierarchy: **Joe D  Richards → Scorpio Mining Inc → Williams 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

- **operator_operates_mine:** R F P Inc → Williams No 2; 1988-12-01 to 1990-07-01; source msha-controller-operator-history
- **controller_controls_mine:** Perrine Robert F → Williams No 2; 1988-12-01 to 1990-12-11; source msha-controller-operator-history
- **controller_controls_operator:** Perrine Robert F → R F P Inc; 1988-12-01 to 1990-07-01; source msha-controller-operator-history
- **controller_controls_mine:** Joe D  Richards → Williams No 2; 1989-07-12 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** B M H Inc → Williams No 2; 1990-07-02 to 1991-09-11; source msha-controller-operator-history
- **controller_controls_mine:** Gugliotta Herman S Jr Et Al → Williams No 2; 1990-07-02 to 1991-09-11; source msha-controller-operator-history
- **controller_controls_operator:** Gugliotta Herman S Jr Et Al → B M H Inc; 1990-07-02 to 1991-09-11; source msha-controller-operator-history
- **operator_operates_mine:** Scorpio Mining Inc → Williams No 2; 1991-09-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joe D  Richards → Scorpio Mining Inc; 1991-09-12 to current/open; source msha-controller-operator-history