# Relationship history for MSHA mine 4700875

Current hierarchy: **La Crosse Concrete Company → Standard Materials Corp → Potter 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:** L H Jessop & Sons Inc → Potter Pit; 1950-01-01 to 1978-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Jessop L H & Sons Inc → Potter Pit; 1950-01-01 to 1978-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Jessop L H & Sons Inc → L H Jessop & Sons Inc; 1950-01-01 to 1978-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Black River Sand & Gravel → Potter Pit; 1978-04-01 to 1979-05-10; source msha-controller-operator-history
- **controller_controls_mine:** Kenneth  Wilber → Potter Pit; 1978-04-01 to 1979-05-10; source msha-controller-operator-history
- **controller_controls_operator:** Kenneth  Wilber → Black River Sand & Gravel; 1978-04-01 to 1979-05-10; source msha-controller-operator-history
- **operator_operates_mine:** Standard Materials Corp → Potter Pit; 1979-05-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** La Crosse Concrete Company → Potter Pit; 1979-05-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** La Crosse Concrete Company → Standard Materials Corp; 1979-05-11 to current/open; source msha-controller-operator-history