# Relationship history for MSHA mine 4701558

Current hierarchy: **Harold  Richter → Richter Ready Mix & Construction Inc → RICHTER PIT & MILL**

- 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:** Richter Ready Mix & Construction Inc → RICHTER PIT & MILL; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Harold  Richter → RICHTER PIT & MILL; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harold  Richter → Richter Ready Mix & Construction Inc; 1950-01-01 to current/open; source msha-controller-operator-history