# Relationship history for MSHA mine 4300226

Current hierarchy: **Todd  Merchant → Collins Sand & Stone Inc → COLLINS 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:** Collins Sand & Gravel → COLLINS PIT; 1950-01-01 to 1990-05-10; source msha-controller-operator-history
- **controller_controls_mine:** John P  Collins → COLLINS PIT; 1950-01-01 to 1990-05-10; source msha-controller-operator-history
- **controller_controls_operator:** John P  Collins → Collins Sand & Gravel; 1950-01-01 to 1990-05-10; source msha-controller-operator-history
- **operator_operates_mine:** L W Young Excavating → COLLINS PIT; 1990-05-11 to 1991-09-29; source msha-controller-operator-history
- **controller_controls_mine:** Young Lawrence W → COLLINS PIT; 1990-05-11 to 1991-09-29; source msha-controller-operator-history
- **controller_controls_operator:** Young Lawrence W → L W Young Excavating; 1990-05-11 to 1991-09-29; source msha-controller-operator-history
- **operator_operates_mine:** Collins Sand & Stone Inc → COLLINS PIT; 1991-09-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Todd  Merchant → COLLINS PIT; 1991-09-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Todd  Merchant → Collins Sand & Stone Inc; 1991-09-30 to current/open; source msha-controller-operator-history