# Relationship history for MSHA mine 2401279

Current hierarchy: **McCormick Inc → Meyer Construction Company → Meyer Construction Crusher #1**

- 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:** Meyer Construction Company → Meyer Construction Crusher #1; 1950-01-01 to 1983-12-08; source msha-controller-operator-history
- **controller_controls_mine:** Meyer Ivan → Meyer Construction Crusher #1; 1950-01-01 to 1983-12-08; source msha-controller-operator-history
- **controller_controls_operator:** Meyer Ivan → Meyer Construction Company; 1950-01-01 to 1983-12-08; source msha-controller-operator-history
- **controller_controls_mine:** McCormick Inc → Meyer Construction Crusher #1; 1981-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Meyer Construction Company → Meyer Construction Crusher #1; 1983-12-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** McCormick Inc → Meyer Construction Company; 1983-12-09 to current/open; source msha-controller-operator-history