# Relationship history for MSHA mine 0600266

Current hierarchy: **Wayne C  Williams → Wayne C Williams-General Construction Inc → SKYLINE QUARRY**

- 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:** Skyline Quarry → SKYLINE QUARRY; 1950-01-01 to 1980-07-15; source msha-controller-operator-history
- **controller_controls_mine:** Paul  Weiser → SKYLINE QUARRY; 1950-01-01 to 1980-07-15; source msha-controller-operator-history
- **controller_controls_operator:** Paul  Weiser → Skyline Quarry; 1950-01-01 to 1980-07-15; source msha-controller-operator-history
- **controller_controls_mine:** Wayne C  Williams → SKYLINE QUARRY; 1979-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Wayne C Williams-General Construction Inc → SKYLINE QUARRY; 1980-07-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wayne C  Williams → Wayne C Williams-General Construction Inc; 1980-07-16 to current/open; source msha-controller-operator-history