# Relationship history for MSHA mine 0402711

Current hierarchy: **Robert C  McLaughlin; Michael J  McLaughlin → Eureka Sand & Gravel Co Inc → ALTON 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:** S & A Development Company Inc → ALTON PIT & MILL; 1950-01-01 to 1981-08-26; source msha-controller-operator-history
- **controller_controls_mine:** Shirley  Gundlach → ALTON PIT & MILL; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shirley  Gundlach → S & A Development Company Inc; 1950-01-01 to 1981-08-26; source msha-controller-operator-history
- **controller_controls_mine:** Michael J  McLaughlin et al → ALTON PIT & MILL; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Eureka Sand & Gravel Co Inc → ALTON PIT & MILL; 1981-08-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael J  McLaughlin et al → Eureka Sand & Gravel Co Inc; 1981-08-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert C  McLaughlin et al → Eureka Sand & Gravel Co Inc; 1981-08-27 to current/open; source msha-controller-operator-history