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US2013170A
|
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Backfiller mechanism
|
|
US1998520A
|
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Swivel barricade structure with attached supports
|
|
US1966597A
|
|
Hydropneumatic bucket cleaner
|
|
US1947356A
|
|
Tamper backfilling machine
|
|
US1924455A
|
|
Swinging conveyer mechanism
|
|
US1889810A
|
|
Excess pressure relieving device
|
|
US1832787A
|
|
Extension boom for excavators
|
|
US1969522A
|
|
Universal balanced grade indicator
|
|
US1814738A
|
|
Man hole form of adjustable sections
|
|
US1838151A
|
|
Barricade structure
|
|
US1748655A
|
|
Tamper mechanism
|
|
US1842193A
|
|
Swinging conveyer trencher
|
|
US1703320A
|
|
Trench-excavating machine
|
|
US1632846A
|
|
Sectional form
|
|
US1684882A
|
|
Tamping machine
|
|
US1553833A
|
|
Excavating machine
|
|
US1527438A
|
|
Ditching machine
|
|
US1113138A
|
|
Cable-splice.
|
|
CA316472A
|
|
Man-hole form of adjustable sections
|
|
CA276221A
|
|
Excavating machine
|
