# Relationship history for MSHA mine 2700293

Current hierarchy: **James  Marcou → Marcou Construction Company Inc → Portable 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:** Marcou Corp → Portable Crusher #1; 1991-03-01 to 2002-05-28; source msha-controller-operator-history
- **controller_controls_mine:** James  Marcou et al → Portable Crusher #1; 1991-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James  Marcou et al → Marcou Corp; 1991-03-01 to 2002-05-28; source msha-controller-operator-history
- **controller_controls_mine:** James  Marcou et al → Portable Crusher #1; 1996-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Marcou Construction Company Inc → Portable Crusher #1; 2002-05-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James  Marcou et al → Marcou Construction Company Inc; 2002-05-29 to current/open; source msha-controller-operator-history