# Relationship history for MSHA mine 4405980

Current hierarchy: **William D  Humphreys → Greater Wise Inc → No 1 Strip**

- 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:** William D  Humphreys et al → No 1 Strip; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** River Processing Inc → No 1 Strip; 1983-03-01 to 1984-01-16; source msha-controller-operator-history
- **controller_controls_mine:** Humphreys Bill G & Fred Langley Et Al → No 1 Strip; 1983-03-01 to 1984-01-16; source msha-controller-operator-history
- **controller_controls_operator:** Humphreys Bill G & Fred Langley Et Al → River Processing Inc; 1983-03-01 to 1984-01-16; source msha-controller-operator-history
- **operator_operates_mine:** Greater Wise Inc → No 1 Strip; 1984-01-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William D  Humphreys et al → Greater Wise Inc; 1984-01-17 to current/open; source msha-controller-operator-history