MAKE A MEME View Large Image Raytheon ECG prototype.JPG Raytheon Electro-Cardiogram ECG prototype Waltham Historical Society Waltham Massachusetts USA Own Manufactured circa early 1950s ; photograph taken March 28 2009 Daderot Public domain ECG devices Raytheon
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Keywords: Raytheon ECG prototype.JPG Raytheon Electro-Cardiogram ECG prototype Waltham Historical Society Waltham Massachusetts USA Own Manufactured circa early 1950s ; photograph taken March 28 2009 Daderot Public domain ECG devices Raytheon
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