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Thank you simtang for the photos.  In the 1950s, there was a man selling small packages of preserved olives in my neighbourhood.  He walked along the street and made his presence known by blowing a small instrument that sounded like a mini trumpet.  We would get his attention, then threw out 10 cents towards him.  He would "throw up" his package into your balcony.  For most shophouses, he had a large target to aim at.  When he missed, he threw another one.  Early version of carrier delivery! Regards,  Peter