# Relationship history for MSHA mine 5400496

Current hierarchy: **Miguel H  Placer → Inversiones Multiples de Puerto Rico Corp. → MP Sand & Gravel**

- 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

- **controller_controls_mine:** Miguel H  Placer → MP Sand & Gravel; 1999-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Gravero San Lorenzo → MP Sand & Gravel; 2016-02-29 to 2017-08-08; source msha-controller-operator-history
- **controller_controls_operator:** Miguel H  Placer → Gravero San Lorenzo; 2016-02-29 to 2017-08-08; source msha-controller-operator-history
- **operator_operates_mine:** Inversiones Multiples de Puerto Rico Corp. → MP Sand & Gravel; 2017-08-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Miguel H  Placer → MP Sand & Gravel; 2017-08-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Miguel H  Placer → Inversiones Multiples de Puerto Rico Corp.; 2017-08-09 to current/open; source msha-controller-operator-history