In Currency ExchangeiTake Advantage Of The Change In Shift To*9Complete Robbery In 15 Minutes.Three armed bandits took $4,500 from the Hamilton Currency exchange, 7100 S. Wentworth ave., in a fifteen-minute robbery Friday morning.According to Detective Peter VanderKamp, of the Englewoodpolice station, two of the three men walked into the currency exchange at 11:30 a.m. One walked to the end of the counter, and the other to the front of the place. Then the third man entered the exchange.The man at the front scaled a six-and-a-half foot glass wall ini:front of the cage and took the cash. No one was in the cage at the time of the robbery, Vander-! Kamp said. John Novak, 1913 S.iMay st., the cashier, had just stepped out to ask the woman who was to relieve him to come into the cage.According to descriptions of the three men, all Negroes, given to the police, the first man was between 35 and 40 years old, about six feet tall, weighing 180 pounds, and dark skinned. He was wearing a hat, a gray tweed top coat, and black pointed shoes, and carried a .45 automatic revolver* The second man was 35*40 years old, about five feet, ten inches tall, weighed about 145 pounds,and had medium brown skin*He wore a brown plaid car coat, a beige sports shirt, blue jeans, a fedora hat, and old-looking brown shoes. He, too, carried a .45 automatic. No description was available of the third man.The robbers bound two customers, and three clerks, Jane Frazer, 2857 W. 98th pi., Evergreen Park; C o r r i n e Foster, Markham, and Clarence Kenny, Park Forest, along with Novak, and left them in the back room of the currency exchange.Detective VanderKamp said the robbers must have studied the place before the hold-up because they knew just when Novak would be out of the cage* He leaves the counter once each morning to call his relief clerk, according to the detective.