Possible Clues:

• Thin strip for plastering
• Plasterer's backing
• Not all of machine was needed for strip of wood
• Strip of wood used with plaster
• Strip of wood, backing for plaster say
• Thin, narrow strip
• Bedmaker's strip?
• Plasterer's reinforcement
• Strip of wood used as a base for plastering
• Thin strip of wood often used in plastering