# Relationship history for MSHA mine 4607464

Current hierarchy: **Fry William Joe → Bend Branch Coal Company → No 4 Mine**

- 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:** Allen T  Workman Jr → No 4 Mine; 1986-08-25 to 1992-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Sharples Coal Corp → No 4 Mine; 1988-02-01 to 1988-03-08; source msha-controller-operator-history
- **controller_controls_operator:** Allen T  Workman Jr → Sharples Coal Corp; 1988-02-01 to 1988-03-08; source msha-controller-operator-history
- **controller_controls_mine:** Fry William Joe → No 4 Mine; 1988-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bend Branch Coal Company → No 4 Mine; 1988-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fry William Joe → Bend Branch Coal Company; 1988-03-09 to current/open; source msha-controller-operator-history