Possible Clues:

• Corporate symbols, or how to make the answers to 15-/22-Across and 34-/46-Across match their clues
• Deal with old currency symbols that are put across here
• Characteristics of what banks in Munich used to do?
• Many commercial slogans
• Intellectual property protection ... or what the starts of 17-, 21-, 39- and 57-Across once were
• Winds pick up vessel headed by master making peculiar signs
• What the puzzle's long answers all were
• Corporate logos, e.g.
• Do business like an old German banker?
• Play-Doh and Silly Putty, e.g.