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JW Skaggs - US Patent 4,687,075, 1987 - Google Patents
... ods of time and at varying heights above ground ... invention further relates to an improved
safety 15 feature ... is standing on a ladder rung at heights above ground ...
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PL Macrorie, RC Rohrenbacher, SB Austin - US Patent 4,311,208, 1982 - Google Patents
... Such ladders are frequently used in LADDER SAFETY LAMP telephone ... until the user descends
from the ladder stepping on ... breaking 25 the light beam a second time. ...
Anti-slip device for ladder rungs -
JR Nelson, RF Donald-Hill - US Patent 5,692,581, 1997 - freepatentsonline.com
... This coating can become a safety hazard, heightening the ... used/installed ladder rungs,
then the ladder rungs have to ... are not only costly, but time consuming and ...
Detecting races in Relay Ladder Logic programs -
A Aiken, M F?hndrich, Z Su - International Journal on Software Tools for Technology …, 2000 - Springer
... for factory down-time) or human safety (for rides ... procedures, and conditionals),
and real-time computation (timers ... consists of a set of ladder rungs with each ...
Mobile ladder-scaffolding system -
RS Jacobs - US Patent 4,232,759, 1980 - freepatentsonline.com
... of the building providing workman support for safety and convenience in ... to the building
to hold the ladder structure vertical at all times comprises a ...
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TM Shingler - US Patent 3,854,550, 1974 - Google Patents
... bled for ease of shipment, ? assembly time being very ... a scaffold deck placed high
on the 10 ladder. ... resist any combination of loads, plus safety factors to ...
Deaths and injuries caused by slipping, tripping and falling -
DP Manning - Ergonomics, 1983 - informaworld.com
... surface such as floorboards, duckboards, asbestos roofs and ladder rungs. ... are also
the commonest lost-time accidents in ... of the Health and Safety Executive, and ...
Ladder stabilizer comprising top extension arms and attached stabilizer bars -
US Patent 5,012,895, 1991 - freepatentsonline.com
... defend lawsuits, the need for numerous safety warnings on ladders, the loss of
executive time in dealing ... ladders, and the number of ladder manufacturers which ...
Safety extension for a fixed ladder with an adjustable mount -
RJ Lyons - US Patent 4,546,855, 1985 - freepatentsonline.com
... nor easy to attach to the manhole ladder or manhole ... The attachment of prior safety
devices to these fixed ladders has proved to be both time consuming and ...
Safety platform attachment apparatus -
RL Panicci - US Patent 5,465,809, 1995 - freepatentsonline.com
... and more specifically to a safety platform attachment ... ladders for even a short time
causes discomfort ... surface area generally provided by ladder rungs on which ...
Source: Google Scholar |