The Hymanotor, a new model of Hyman’s pacemaker probably intended for laboratory experiments with animals, 1933.
An artificial pacemaker (PM) is an electronic device implanted in the body to regulate the heart beat. It consists of a battery and electronic circuits enclosed in a hermetically sealed can. A PM treats abnormal heart rhythms called Cardiac dysrhythmia or arrhythmias, specifically slow arrhythmias called bradycardia. The PM delivers electrical stimuli over leads with electrodes in contact with the heart.
The GM stands for General Mola involved in Spanish Civil War 1936 to 1939 and World War II. The General Mola sailed in the Spanish Navy until 1959.
This Sub was made in Italy by Franco Tosi and was involved in sinking "City Barcelona", "Granada"and "Cabo de Palos".