# Grass Instrument Co.

- Location (FDA's records): Mchenry, IL
- FDA decisions: 6 (1977–2002): 6 510(k) clearances
- Product codes: OLV (2), GWJ (1), JXE (1), GWE (1), GWK (1)
- Predicates its devices cite: 4 (0 its own); citations of its devices by later devices: 6 (0 its own)
- Recalls linked to its devices: 0 (0 Class I)
- Data: FDA decisions to Oct 25, 2026; recalls to Oct 12, 2026

## Firms whose devices it cites most
- Bio-Logic Systems Corp.: 2 (https://510kreport.com/company/bio-logic-systems)
- Grass-Telefactor Product Group: 1 (https://510kreport.com/company/grass-telefactor-product-group)
- Compumedics Neuro Science Pty, Ltd.: 1 (https://510kreport.com/company/compumedics-neuro-science)

## Firms that cite its devices most
- Astro-Med, Inc.: 3 (https://510kreport.com/company/astro-med)
- Natus Medical Incorporated Dba Excel-Tech Ltd. (Xltek): 1 (https://510kreport.com/company/natus-medical-dba-excel-tech-xltek)
- Uromed Corp.: 1 (https://510kreport.com/company/uromed)
- Axon Systems, Inc.: 1 (https://510kreport.com/company/axon-systems)

## Its most-cited devices
- K021807: Grass-Telefactor AS40 Amplifier System (2002), cited by 4
- K844216: Grass Model NL Facial Nerve Locator & Monitor (1985), cited by 1
- K994142: Grass TS3201/6401 Eeg Amplifier System (2000), cited by 1

## Recent decisions
- K021807: Grass-Telefactor AS40 Amplifier System (Aug 29, 2002)
- K994142: Grass TS3201/6401 Eeg Amplifier System (Mar 6, 2000)
- K844216: Grass Model NL Facial Nerve Locator & Monitor (Jan 18, 1985)
- K812061: Model S10VS Visual Stimulator (Aug 20, 1981)
- K810539: Model S10CTCM Auditory Stimulator (Mar 17, 1981)
- K771742: Evoked Response Sys., Model 10 (Nov 22, 1977)

Source page: https://510kreport.com/company/grass-instrument