# Relationship history for MSHA mine 3609523

Current hierarchy: **Robert A Signor; Ronald F Signor; Edward J Signor → Signor Brothers Contracting LLC → Cherry Ridge Pit**

- 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:** Robert A  Signor et al → Cherry Ridge Pit; 2002-05-06 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Signor Brothers Contracting → Cherry Ridge Pit; 2007-05-23 to 2015-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Robert A  Signor et al → Signor Brothers Contracting; 2007-05-23 to 2015-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Edward J  Signor et al → Signor Brothers Contracting; 2007-05-23 to 2015-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Signor Brothers Contracting LLC → Cherry Ridge Pit; 2016-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ronald F Signor et al → Cherry Ridge Pit; 2016-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ronald F Signor et al → Signor Brothers Contracting LLC; 2016-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Edward J Signor et al → Signor Brothers Contracting LLC; 2016-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert A Signor et al → Signor Brothers Contracting LLC; 2016-01-01 to current/open; source msha-controller-operator-history