Parallel rules are the most basic plotting instrument.
Davis Parallel Rules are :
- Completely transparent with a clear optical finish for exact plotting.
- Each 15 (38 cm) blade features large, easy-to-grip handles.
- Precision molded for the most accurate straight line plotting.
- Features sharp printing process, high gloss finish on front and back, and overlamination for durability.
- Completely transparent clear optical finish allows for exact plotting.
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