# Relationship history for MSHA mine 2900481

Current hierarchy: **GMS Inc; David  Shoup → United Materials, LLP → Roswell 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

- **operator_operates_mine:** Roswell Ready Mix Inc → Roswell Pit; 1950-01-01 to 2009-05-19; source msha-controller-operator-history
- **controller_controls_mine:** Bill B  Armstrong Jr  et al → Roswell Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bill B  Armstrong Jr  et al → Roswell Ready Mix Inc; 1950-01-01 to 2009-05-19; source msha-controller-operator-history
- **operator_operates_mine:** Roswell Ready Mix Inc → Roswell Pit; 2009-05-20 to 2015-05-07; source msha-controller-operator-history
- **controller_controls_mine:** Constructors Inc (NM) → Roswell Pit; 2009-05-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Constructors Inc (NM) → Roswell Ready Mix Inc; 2009-05-20 to 2015-05-07; source msha-controller-operator-history
- **operator_operates_mine:** United Materials, LLP → Roswell Pit; 2015-05-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** GMS Inc et al → Roswell Pit; 2015-05-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** GMS Inc et al → United Materials, LLP; 2015-05-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David  Shoup et al → United Materials, LLP; 2015-05-08 to current/open; source msha-controller-operator-history