# Relationship history for MSHA mine 4700877

Current hierarchy: **Ronald J  Olynick → John S Olynick Inc → L-W Pit**

- 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:** Ladysmith Concrete Company → L-W Pit; 1950-01-01 to 1986-05-06; source msha-controller-operator-history
- **controller_controls_mine:** Wissota Sand & Gravel Company → L-W Pit; 1950-01-01 to 1986-05-06; source msha-controller-operator-history
- **controller_controls_operator:** Wissota Sand & Gravel Company → Ladysmith Concrete Company; 1950-01-01 to 1986-05-06; source msha-controller-operator-history
- **controller_controls_mine:** Ronald J  Olynick → L-W Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** John S Olynick Inc → L-W Pit; 1986-05-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ronald J  Olynick → John S Olynick Inc; 1986-05-07 to current/open; source msha-controller-operator-history