Abstract: A method and system for storing and retrieving compressed data such as ZIP+4 add-on's for postal addresses, compresses source data records by defining a group of attributes which represent the characteristics of source data records and the relationships between source data records and between elements of source data records, each attribute having an associated predetermined set of rules which define specifically the characteristics or relationships represented by that attribute. Source data records are compressed by assigning to a record a tuple of attribute values and a set of modifier values. The attribute values each designate a particular one of the set of rules for its corresponding attribute, and the modifier values comprise values which are used by the rules to express the information content of the source data record. The compressed data records are stored in a memory having a hierarchical data organization along with memory address elements for accessing compressed data records.

Abstract: An all-electric radio controlled slack pulling, braking and battery recharging system for logging operations on a moutainside is disclosed. Independent battery powered slack pulling and radio and brake electrical systems are provided, together with alternators which recharge the storage batteries of the electrical system in response to movement of alternator driving sheaves along a skyline in either direction. The drop or skidline is pulled through a carriage by a electric slack puller motor connected through a torque multiplier with a line pulling sheave. Skyline and drop or skidline brakes are applied by low pressure hydraulics boosted by spring pressure and are released by higher hydraulic pressure.