Road surface aperture frame

Details Road surface aperture frame Road surface aperture frame

1999-02-11

2000-07-11

Clark, Doris

Building units and construction elements

Architectural stock material

2501

Patent

active

D04281594

REFERENCES:
patent: D336524 (1993-06-01), White et al.
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Ontario Provincial Standard Drawing OPSD-400.070, Sep. 7, 1993.
Ontario Provincial Standard Drawing OPSD-401.040, Sep. 7, 1993.
Ontario Provincial Standard Drawing OPSD-401.050, Sep. 7, 1993.
CSA Standard C83, Item M-1, 27-Inch Manhole Frame and Cover, 1970.
CSA Standard C83, Item M-2, 30-Inch Manhole Frame and Cover, 1970.
Ontario Provincial Standard Drawing OPSD-401.060, Sep. 7, 1993.
Ontario Provincial Standard Drawing OPSD-402.020, Sep. 7, 1993.
Municipality of Metropolitan Toronto, Department of Works, Drawing No. CA-90R (W.S.), Jun., 1992.

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