# Relationship history for MSHA mine 1511502

Current hierarchy: **Williams Randy → Williams Brothers Coal Company Inc → No 1 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:** Maynard William → No 1 Mine; 1977-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Golden Homes Inc → No 1 Mine; 1978-08-01 to 1979-02-19; source msha-controller-operator-history
- **controller_controls_operator:** Maynard William → Golden Homes Inc; 1978-08-01 to 1979-02-19; source msha-controller-operator-history
- **operator_operates_mine:** Williams Brothers Coal Company Inc → No 1 Mine; 1979-02-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Williams Randy → No 1 Mine; 1979-02-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Williams Randy → Williams Brothers Coal Company Inc; 1979-02-20 to current/open; source msha-controller-operator-history