Abstract: Network devices that (a) test that GPS-clock enabled network devices have synchronized clocks, (b) identify non-GPS-clock enabled network devices with symmetric latencies as likely to be synchronized to GPS-clock enabled neighbor devices, (c) determine clock skews of remaining network devices not identified in (a) or (b) against the network devices identified in (a) and (b), and re-evaluate latencies of the GPS-clock enabled network devices, the non-GPS-clock enabled network devices, and the remaining devices based on the results of (a)-(c).

Abstract: An overlay network system includes multiple point-of-presence (POP) devices each including a path finding component and corresponding telemetry component, agent component, and routing daemon. The telemetry component generates latency measurements for the POP on which it is disposed. A centralized billboard service provides border gateway protocol (BGP) announcements and point-of-presence (POP) peering decisions to each of the agent components. On each of the POPs, the path finding component and corresponding telemetry component, agent component, and routing daemon cooperate to transform the BGP announcements, peering decisions, and latency measurements into routing tables and link selections for packet streams routed through the POPs.

Abstract: Network devices that (a) test that GPS-clock enabled network devices have synchronized clocks, (b) identify non-GPS-clock enabled network devices with symmetric latencies as likely to be synchronized to GPS-clock enabled neighbor devices, (c) determine clock skews of remaining network devices not identified in (a) or (b) against the network devices identified in (a) and (b), and re-evaluate latencies of the GPS-clock enabled network devices, the non-GPS-clock enabled network devices, and the remaining devices based on the results of (a)-(c).

Abstract: Systems including a telemetry service, a graph service coupled to transform outputs of the telemetry service into path routes through an overlay network, a billboard service configured to transform the path routes into border gateway protocol (BGP) announcements and point-of-presence (POP) peering decisions, multiple agent components, and multiple routing daemons, each disposed on a different POP of the overlay network along with a corresponding one of the agent components. The daemons receive BGP announcements and peering decisions from the billboard service via the corresponding agent component and transform the BGP announcements and peering decisions into routing tables for the POPs.

Abstract: A modular surfacing system provides solid seamless natural stone modular pieces cut from the same stone block for matching coloration and pattern. The pieces are cut into any desired sizes with wide edging of any desirable thickness and solid piece corners as well as mating modular surface tiles and mating modular backsplash tiles. Since all pieces are cut from a thick block of stone, such as marble or granite, horizontal, vertical, and depth cuts may be made of any desired length and shape to create truly matching modular pieces of any desired dimensions.

Abstract: A modular surfacing system has edge pieces with skirts attached using a break away adhesive material allowing separation of the pieces without damage. The edge rail pieces may be used alone or with the skirt piece attached at any of a variety of overhanging heights to cover different substrate edge thicknesses. Skirts may be interchanged. The modular surfacing pieces may be solid seamless cut natural stone modular pieces, laminated natural stone modular pieces, composite material or synthetic material shaped into modular pieces. The pieces are cut into any desired sizes with wide edging of any desirable thickness and solid piece corners as well as mating modular surface tiles and mating modular backsplash tiles.

Abstract: A rectangular double walled cryogenic freezer has a vacuum space filled with layers of a reflective material. The support material is an open-celled three dimensional geometric grid that provides structural support for the freezer walls to prevent wall deformation when a vacuum is drawn.

Abstract: An elevator for adjusting the elevation of a code reader of a high speed mail sorting machine. The elevator is powered by a reversible DC electric motor which operates an extensible and retractable linear actuator. The actuator connects with a platform on which the reader is mounted. A control circuit for the motor includes a digital comparitor which compares the desired elevation of the reader with the actual elevation sensed by a potentiometer. A transistorized motor drive circuit controlled by the comparitor applies current to the motor in opposite directions to cause extension or retraction of the actuator, depending upon whether the reader is below or above the desired elevation. Upper and lower limit switches limit the range of movement of the reader.

Abstract: An improved envelope tracking and control system for a mail sorting machine of the type which reads a sorting code imprinted on each envelope and deposits the envelope in the proper sorting bin by deflecting a diverter gate associated with the bin. Each diverter mechanism has two sets of photo sensors which sense the presence of an approaching envelope. Tracking circuitry processes the sort code obtained from the envelope and transfers the processed data to the tracking circuit for the next diverter if the data does not coincide with a code that has been preassigned to the diverter. The processed data is held in a latch circuit and is passed on only if the envelope is sensed by the second set of photo sensors. If there is coincidence of the data, a one shot pulse applied to a solenoid deflects the appropriate gate for a predetermined time period that avoids possible damage to the solenoid or to the circuit components.